<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:0014d30a-3c2a-4882-b717-7b0eb9a07f6a,g:c7a78cfa-9c71-444f-a230-9ba7f05d9d77-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.nninc.com/role/DocumentandEntityInformation" xlink:type="simple" xlink:href="nnbr-20231231.xsd#DocumentandEntityInformation"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/DocumentandEntityInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_ee00a81e-a65c-4371-b414-c9fcb738f0d6" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntitiesTable_ee00a81e-a65c-4371-b414-c9fcb738f0d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_0505708c-99df-481b-a0f7-46d724f03edb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_ee00a81e-a65c-4371-b414-c9fcb738f0d6" xlink:to="loc_us-gaap_StatementClassOfStockAxis_0505708c-99df-481b-a0f7-46d724f03edb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_0505708c-99df-481b-a0f7-46d724f03edb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_0505708c-99df-481b-a0f7-46d724f03edb" xlink:to="loc_us-gaap_ClassOfStockDomain_0505708c-99df-481b-a0f7-46d724f03edb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_7aa6fc98-e2f4-42d9-9abe-d0c06ad7bf0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_0505708c-99df-481b-a0f7-46d724f03edb" xlink:to="loc_us-gaap_ClassOfStockDomain_7aa6fc98-e2f4-42d9-9abe-d0c06ad7bf0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_61fcd31e-5416-4853-8d78-3b81dcfdff16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7aa6fc98-e2f4-42d9-9abe-d0c06ad7bf0f" xlink:to="loc_us-gaap_CommonStockMember_61fcd31e-5416-4853-8d78-3b81dcfdff16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_ae237044-7f3d-4fdc-a53c-61c16198b84b" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_DocumentType_ae237044-7f3d-4fdc-a53c-61c16198b84b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_322bf6ec-51fc-4b0d-805c-a80752837813" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentAnnualReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_DocumentAnnualReport_322bf6ec-51fc-4b0d-805c-a80752837813" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_f0e111a8-fa23-4027-b552-c3cc4510e36c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_DocumentPeriodEndDate_f0e111a8-fa23-4027-b552-c3cc4510e36c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_8e470e6b-63b5-4991-8283-eaeb30a009f4" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_DocumentTransitionReport_8e470e6b-63b5-4991-8283-eaeb30a009f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_99d18000-c1d3-44b1-ba05-7c25d7cd5963" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityFileNumber_99d18000-c1d3-44b1-ba05-7c25d7cd5963" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_3b3d0c71-412e-4884-9cbe-1d18740a8539" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityRegistrantName_3b3d0c71-412e-4884-9cbe-1d18740a8539" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_627c9797-14f2-40ce-88f1-f3d66e71f9d5" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityIncorporationStateCountryCode_627c9797-14f2-40ce-88f1-f3d66e71f9d5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_935ea509-9dee-4155-99ba-111bd217082d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityTaxIdentificationNumber_935ea509-9dee-4155-99ba-111bd217082d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_fcdf7ba5-80fa-40dc-b57b-337839b728c5" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityAddressAddressLine1_fcdf7ba5-80fa-40dc-b57b-337839b728c5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_6679e99c-a890-4d8c-8dfa-95373113d610" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityAddressCityOrTown_6679e99c-a890-4d8c-8dfa-95373113d610" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_8a1f6378-8464-4877-99b5-3651e9388c7c" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityAddressStateOrProvince_8a1f6378-8464-4877-99b5-3651e9388c7c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_ea1c58a8-bbb6-4392-959b-909cd43bee27" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityAddressPostalZipCode_ea1c58a8-bbb6-4392-959b-909cd43bee27" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_b7f47b3f-5e3f-4a47-9703-19dfb498c1ad" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_CityAreaCode_b7f47b3f-5e3f-4a47-9703-19dfb498c1ad" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_21179935-86fa-4a7b-8230-02ee4b60432f" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_LocalPhoneNumber_21179935-86fa-4a7b-8230-02ee4b60432f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_744b6e06-d8cc-4986-addc-2167367748c6" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_Security12bTitle_744b6e06-d8cc-4986-addc-2167367748c6" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_3e3535fc-70c3-436e-b2b4-0f218a4cb02e" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_TradingSymbol_3e3535fc-70c3-436e-b2b4-0f218a4cb02e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_84282eca-1d6b-4254-9e4e-7c7df889bcff" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_SecurityExchangeName_84282eca-1d6b-4254-9e4e-7c7df889bcff" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_c8367e68-d318-4262-bc81-a6ef353297b7" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_c8367e68-d318-4262-bc81-a6ef353297b7" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityVoluntaryFilers_173a6f6c-98a4-4c3a-af86-6c75f509f5ad" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityVoluntaryFilers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityVoluntaryFilers_173a6f6c-98a4-4c3a-af86-6c75f509f5ad" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_0b70c5cc-e59b-45c7-86f9-45203c337487" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityCurrentReportingStatus_0b70c5cc-e59b-45c7-86f9-45203c337487" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_e9ae7331-1130-4801-a4ea-b88291a04975" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityInteractiveDataCurrent_e9ae7331-1130-4801-a4ea-b88291a04975" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_0f3bee36-4d8b-4fd4-ae2f-b9f7248c90b5" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityFilerCategory_0f3bee36-4d8b-4fd4-ae2f-b9f7248c90b5" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_74152043-2ae4-49c3-8e8f-0f3687a77ea1" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntitySmallBusiness_74152043-2ae4-49c3-8e8f-0f3687a77ea1" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_e413337d-cbab-4976-bff1-258a3c2f2b71" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityEmergingGrowthCompany_e413337d-cbab-4976-bff1-258a3c2f2b71" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag_cc75f8c0-bbf4-4b1d-a7d7-0ed571acd437" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_IcfrAuditorAttestationFlag_cc75f8c0-bbf4-4b1d-a7d7-0ed571acd437" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_c8dcbbeb-7d4f-4dda-8072-eb7061c10e93" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityShellCompany_c8dcbbeb-7d4f-4dda-8072-eb7061c10e93" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityPublicFloat_d187e519-8b69-4090-8251-429fd82290ec" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityPublicFloat"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityPublicFloat_d187e519-8b69-4090-8251-429fd82290ec" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_eb30a184-f24f-446c-a3f6-8fb569d70a21" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_eb30a184-f24f-446c-a3f6-8fb569d70a21" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentsIncorporatedByReferenceTextBlock_bbc6c17e-1ffa-4438-adac-709d3c6af0b4" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentsIncorporatedByReferenceTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_DocumentsIncorporatedByReferenceTextBlock_bbc6c17e-1ffa-4438-adac-709d3c6af0b4" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_a4019810-8ccf-4ab7-8c82-f593dc1ae7d9" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_EntityCentralIndexKey_a4019810-8ccf-4ab7-8c82-f593dc1ae7d9" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_c4ef74d8-c6b8-4f80-a805-053d30509ede" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_CurrentFiscalYearEndDate_c4ef74d8-c6b8-4f80-a805-053d30509ede" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_1501806c-6b41-4caa-8ad2-e000601738bb" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_DocumentFiscalYearFocus_1501806c-6b41-4caa-8ad2-e000601738bb" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_602b51cb-9ec8-4f0d-826d-479b95c6e0e1" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_DocumentFiscalPeriodFocus_602b51cb-9ec8-4f0d-826d-479b95c6e0e1" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_53683fe1-be96-40fc-99eb-97593be024ac" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_AmendmentFlag_53683fe1-be96-40fc-99eb-97593be024ac" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFinStmtErrorCorrectionFlag_451ef78a-9a54-4607-b48f-c7a2e53d8e28" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentFinStmtErrorCorrectionFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_160e8eb2-6722-41c5-9b79-e60b74b5ff9f" xlink:to="loc_dei_DocumentFinStmtErrorCorrectionFlag_451ef78a-9a54-4607-b48f-c7a2e53d8e28" xlink:type="arc" order="34"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/AuditInformation" xlink:type="simple" xlink:href="nnbr-20231231.xsd#AuditInformation"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/AuditInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_73f636d1-cfd5-452a-a5b3-42d923873f70" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_487d4491-cd55-43c9-9264-5e9695e9fe87" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_73f636d1-cfd5-452a-a5b3-42d923873f70" xlink:to="loc_dei_DocumentInformationTable_487d4491-cd55-43c9-9264-5e9695e9fe87" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationDocumentAxis_aea6e73c-d13c-49ed-80ed-eb6af79daae3" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentInformationDocumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_487d4491-cd55-43c9-9264-5e9695e9fe87" xlink:to="loc_dei_DocumentInformationDocumentAxis_aea6e73c-d13c-49ed-80ed-eb6af79daae3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentDomain_aea6e73c-d13c-49ed-80ed-eb6af79daae3_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_DocumentInformationDocumentAxis_aea6e73c-d13c-49ed-80ed-eb6af79daae3" xlink:to="loc_dei_DocumentDomain_aea6e73c-d13c-49ed-80ed-eb6af79daae3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentDomain_a75390af-b35a-4436-82fa-7d37f83729de" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_DocumentInformationDocumentAxis_aea6e73c-d13c-49ed-80ed-eb6af79daae3" xlink:to="loc_dei_DocumentDomain_a75390af-b35a-4436-82fa-7d37f83729de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorName_be24b960-e8eb-4915-83ee-3ebeab5a3932" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AuditorName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_73f636d1-cfd5-452a-a5b3-42d923873f70" xlink:to="loc_dei_AuditorName_be24b960-e8eb-4915-83ee-3ebeab5a3932" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorLocation_86f0e845-fe1c-49cb-b140-41bcd9ca3b3e" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AuditorLocation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_73f636d1-cfd5-452a-a5b3-42d923873f70" xlink:to="loc_dei_AuditorLocation_86f0e845-fe1c-49cb-b140-41bcd9ca3b3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AuditorFirmId_e42c407d-4c17-401b-b51f-18d0e72e2cb0" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AuditorFirmId"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_73f636d1-cfd5-452a-a5b3-42d923873f70" xlink:to="loc_dei_AuditorFirmId_e42c407d-4c17-401b-b51f-18d0e72e2cb0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="nnbr-20231231.xsd#ConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_ce05c144-343f-4659-8e83-798ad8372f43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_1995e03e-3439-46ca-adb8-d3188c031267" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_ce05c144-343f-4659-8e83-798ad8372f43" xlink:to="loc_us-gaap_StatementTable_1995e03e-3439-46ca-adb8-d3188c031267" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_70048d79-e24b-4623-b27f-550d14a191d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1995e03e-3439-46ca-adb8-d3188c031267" xlink:to="loc_us-gaap_StatementClassOfStockAxis_70048d79-e24b-4623-b27f-550d14a191d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_70048d79-e24b-4623-b27f-550d14a191d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_70048d79-e24b-4623-b27f-550d14a191d7" xlink:to="loc_us-gaap_ClassOfStockDomain_70048d79-e24b-4623-b27f-550d14a191d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_eae0333e-e5d2-47cf-b82e-a70caa0cb0b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_70048d79-e24b-4623-b27f-550d14a191d7" xlink:to="loc_us-gaap_ClassOfStockDomain_eae0333e-e5d2-47cf-b82e-a70caa0cb0b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesDPreferredStockMember_2e1724ff-9eef-4d6d-b1dc-5db019dff4c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesDPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_eae0333e-e5d2-47cf-b82e-a70caa0cb0b2" xlink:to="loc_us-gaap_SeriesDPreferredStockMember_2e1724ff-9eef-4d6d-b1dc-5db019dff4c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ce05c144-343f-4659-8e83-798ad8372f43" xlink:to="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:to="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_99617fce-1e22-480c-8439-c7e8db713788" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_99617fce-1e22-480c-8439-c7e8db713788" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_49337dc3-2d78-4df8-bc79-5e4c3121ca79" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_49337dc3-2d78-4df8-bc79-5e4c3121ca79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_4d347dc3-d3ed-480f-aa8d-edc236c1ab58" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:to="loc_us-gaap_InventoryNet_4d347dc3-d3ed-480f-aa8d-edc236c1ab58" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesReceivable_3c704d5c-2abc-4058-bfcf-e986b7ec01be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:to="loc_us-gaap_IncomeTaxesReceivable_3c704d5c-2abc-4058-bfcf-e986b7ec01be" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_b462aef1-9415-4337-a0d6-8d0e9930bcbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_b462aef1-9415-4337-a0d6-8d0e9930bcbf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_70aa0066-0b6e-43ed-b488-a3511a8c9555" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:to="loc_us-gaap_OtherAssetsCurrent_70aa0066-0b6e-43ed-b488-a3511a8c9555" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_82276abc-5f9a-4ed3-9067-307b0a664a04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_a233d211-a27b-478c-8cb1-a0051662ad5d" xlink:to="loc_us-gaap_AssetsCurrent_82276abc-5f9a-4ed3-9067-307b0a664a04" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_ddf65005-c3e8-4007-80ea-90aa32427051" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_ddf65005-c3e8-4007-80ea-90aa32427051" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_99e33faf-b6fe-4024-93b9-2b7692b3ba42" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_99e33faf-b6fe-4024-93b9-2b7692b3ba42" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_9d856d4d-9be7-4e01-b968-78ca9ff967be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_9d856d4d-9be7-4e01-b968-78ca9ff967be" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_dcf56a78-8323-4141-baa0-e45581ce5231" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:to="loc_us-gaap_EquityMethodInvestments_dcf56a78-8323-4141-baa0-e45581ce5231" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_94a03adb-a40d-4023-baa2-3f7d5059ffec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_94a03adb-a40d-4023-baa2-3f7d5059ffec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_e4dcd350-6bca-4897-bf8a-6d2dd4fb48e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_e4dcd350-6bca-4897-bf8a-6d2dd4fb48e7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_35df120c-4f80-4327-98cd-ff6e14f59325" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_897efc5b-6afe-4bd1-9e65-d72d3d2c7aa1" xlink:to="loc_us-gaap_Assets_35df120c-4f80-4327-98cd-ff6e14f59325" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ce05c144-343f-4659-8e83-798ad8372f43" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_69cf8263-38e8-4617-a914-7f3392ac6345" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:to="loc_us-gaap_AccountsPayableCurrent_69cf8263-38e8-4617-a914-7f3392ac6345" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_2fbc9398-d829-413e-af43-30b318e453fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_2fbc9398-d829-413e-af43-30b318e453fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_ba52fa44-a739-420d-9891-9493505fd11b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedIncomeTaxesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_ba52fa44-a739-420d-9891-9493505fd11b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_4e847376-7bec-48b0-ac4a-c474aa946315" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:to="loc_us-gaap_LongTermDebtCurrent_4e847376-7bec-48b0-ac4a-c474aa946315" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_90727fdc-4c15-4d33-b738-79bdd031b816" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_90727fdc-4c15-4d33-b738-79bdd031b816" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_d77de8c8-2275-4a54-93f5-5d4957370569" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_d77de8c8-2275-4a54-93f5-5d4957370569" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_86e2fbae-c030-4b49-8593-8c6348c220d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_be91cd46-3266-4318-86fd-33191fa5bff2" xlink:to="loc_us-gaap_LiabilitiesCurrent_86e2fbae-c030-4b49-8593-8c6348c220d3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_222459e1-d05f-46e6-8618-fce8eb8ecb79" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_222459e1-d05f-46e6-8618-fce8eb8ecb79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_61a84e52-0c9e-4138-9acf-00b6c751819a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_61a84e52-0c9e-4138-9acf-00b6c751819a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_4b0630b4-4859-4328-ade0-b07caf73f40d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_4b0630b4-4859-4328-ade0-b07caf73f40d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_9e6d2af1-3a0e-4ca3-be2c-feef66793f4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_9e6d2af1-3a0e-4ca3-be2c-feef66793f4e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_9862c9af-695b-4d87-8f14-161ffb517cb0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_Liabilities_9862c9af-695b-4d87-8f14-161ffb517cb0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_4d35a850-cc4b-4fab-86b0-68c3b6df220b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_CommitmentsAndContingencies_4d35a850-cc4b-4fab-86b0-68c3b6df220b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_a7ca2d01-0e8f-47a2-98b4-1518bac1c851" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_a7ca2d01-0e8f-47a2-98b4-1518bac1c851" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_6ee1849c-a9ca-42dd-b113-7f76d4a7ffd1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_4eee6ca3-f66a-49b0-bcdb-82273f39e1df" xlink:to="loc_us-gaap_StockholdersEquityAbstract_6ee1849c-a9ca-42dd-b113-7f76d4a7ffd1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_c78cafe8-2cd1-4a71-8102-b072645c297c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6ee1849c-a9ca-42dd-b113-7f76d4a7ffd1" xlink:to="loc_us-gaap_CommonStockValue_c78cafe8-2cd1-4a71-8102-b072645c297c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_f6482b9f-25de-4bad-8eb0-fe16e2dbbed9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6ee1849c-a9ca-42dd-b113-7f76d4a7ffd1" xlink:to="loc_us-gaap_AdditionalPaidInCapital_f6482b9f-25de-4bad-8eb0-fe16e2dbbed9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_b4166d0c-515c-494f-99ee-2804d54629de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6ee1849c-a9ca-42dd-b113-7f76d4a7ffd1" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_b4166d0c-515c-494f-99ee-2804d54629de" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_4e9114a5-834b-481a-bf48-799451c0854b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6ee1849c-a9ca-42dd-b113-7f76d4a7ffd1" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_4e9114a5-834b-481a-bf48-799451c0854b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ab8636e2-278a-493a-a30e-757f7b4f9492" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_6ee1849c-a9ca-42dd-b113-7f76d4a7ffd1" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ab8636e2-278a-493a-a30e-757f7b4f9492" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_09c039ae-1218-4f2e-80b8-11d2c9807c84" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ce05c144-343f-4659-8e83-798ad8372f43" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_09c039ae-1218-4f2e-80b8-11d2c9807c84" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="nnbr-20231231.xsd#ConsolidatedBalanceSheetsParenthetical"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_af39c2d9-ab13-4d8d-9b5e-b4b7d2b39113" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_StatementTable_af39c2d9-ab13-4d8d-9b5e-b4b7d2b39113" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_257f3a9e-6188-44ce-8e1b-834f0ea2b4f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_af39c2d9-ab13-4d8d-9b5e-b4b7d2b39113" xlink:to="loc_us-gaap_StatementClassOfStockAxis_257f3a9e-6188-44ce-8e1b-834f0ea2b4f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_257f3a9e-6188-44ce-8e1b-834f0ea2b4f7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_257f3a9e-6188-44ce-8e1b-834f0ea2b4f7" xlink:to="loc_us-gaap_ClassOfStockDomain_257f3a9e-6188-44ce-8e1b-834f0ea2b4f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_cbd5d19b-afc5-48fc-940e-9f20700b1794" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_257f3a9e-6188-44ce-8e1b-834f0ea2b4f7" xlink:to="loc_us-gaap_ClassOfStockDomain_cbd5d19b-afc5-48fc-940e-9f20700b1794" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesDPreferredStockMember_6b9946fe-63dc-4179-a508-5ef857d99bbe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesDPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_cbd5d19b-afc5-48fc-940e-9f20700b1794" xlink:to="loc_us-gaap_SeriesDPreferredStockMember_6b9946fe-63dc-4179-a508-5ef857d99bbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_47f5063c-5d93-43a4-aba1-1e79adefdd24" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_47f5063c-5d93-43a4-aba1-1e79adefdd24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_bdf74866-a19a-4015-b88c-f53bb92a0d9a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_bdf74866-a19a-4015-b88c-f53bb92a0d9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_604cccc2-60df-41a9-a2db-67eed7653a36" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_CommonStockSharesIssued_604cccc2-60df-41a9-a2db-67eed7653a36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_1938000a-599b-417f-b10f-e7f5585025f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_1938000a-599b-417f-b10f-e7f5585025f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_3e21f0a2-5571-4734-8f27-1dfb358628d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_3e21f0a2-5571-4734-8f27-1dfb358628d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_58273f18-53cb-41cd-b39a-2c40380740b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_58273f18-53cb-41cd-b39a-2c40380740b0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_78c54182-bd8c-4fb0-9826-263d8c1dcd40" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_PreferredStockSharesIssued_78c54182-bd8c-4fb0-9826-263d8c1dcd40" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_95c7b61d-2eec-434a-9e66-d02fdd9cb91d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_15e7eda2-e7c6-4081-a771-871080daf78f" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_95c7b61d-2eec-434a-9e66-d02fdd9cb91d" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/ConsolidatedStatementsofChangesinStockholdersEquity" xlink:type="simple" xlink:href="nnbr-20231231.xsd#ConsolidatedStatementsofChangesinStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/ConsolidatedStatementsofChangesinStockholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_878270c1-d489-4684-a9c4-0c5b477b96a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_StatementTable_878270c1-d489-4684-a9c4-0c5b477b96a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_7f03dd28-3ba7-4a66-9540-b8bb740bb7c6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_878270c1-d489-4684-a9c4-0c5b477b96a2" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_7f03dd28-3ba7-4a66-9540-b8bb740bb7c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7f03dd28-3ba7-4a66-9540-b8bb740bb7c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7f03dd28-3ba7-4a66-9540-b8bb740bb7c6" xlink:to="loc_us-gaap_EquityComponentDomain_7f03dd28-3ba7-4a66-9540-b8bb740bb7c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_d6633e1c-823b-4000-9126-5c2a83ed2e38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7f03dd28-3ba7-4a66-9540-b8bb740bb7c6" xlink:to="loc_us-gaap_EquityComponentDomain_d6633e1c-823b-4000-9126-5c2a83ed2e38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_301c94b1-3586-4fd6-937a-dcc0a33bfaaf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d6633e1c-823b-4000-9126-5c2a83ed2e38" xlink:to="loc_us-gaap_CommonStockMember_301c94b1-3586-4fd6-937a-dcc0a33bfaaf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_6b950035-8fcd-4ec4-bcfc-b3f8d8c41768" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d6633e1c-823b-4000-9126-5c2a83ed2e38" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_6b950035-8fcd-4ec4-bcfc-b3f8d8c41768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_91f25751-1a0c-4698-9310-1ae311a1f1ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d6633e1c-823b-4000-9126-5c2a83ed2e38" xlink:to="loc_us-gaap_RetainedEarningsMember_91f25751-1a0c-4698-9310-1ae311a1f1ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_c35018c5-92d6-4ede-8c0d-c6f9b7edcd4c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_d6633e1c-823b-4000-9126-5c2a83ed2e38" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_c35018c5-92d6-4ede-8c0d-c6f9b7edcd4c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_1f632f89-82b4-44e9-bdd9-c4cc580e72e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_SharesIssued_1f632f89-82b4-44e9-bdd9-c4cc580e72e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8a70f853-54ce-4fdd-887a-6f4d3a9923a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8a70f853-54ce-4fdd-887a-6f4d3a9923a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_51713912-8894-4a14-98a4-62c41d94c696" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_ProfitLoss_51713912-8894-4a14-98a4-62c41d94c696" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStock_9d815947-8f50-4787-9a7f-b0ec1758bd67" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_DividendsPreferredStock_9d815947-8f50-4787-9a7f-b0ec1758bd67" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_c21a5057-95be-4da4-8cd1-6ab2fb9aa5b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_c21a5057-95be-4da4-8cd1-6ab2fb9aa5b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_87135e85-386f-47ee-9439-1bbf4a99a697" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_87135e85-386f-47ee-9439-1bbf4a99a697" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_d2a21686-b7be-412b-bce6-f0356eeb5519" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_d2a21686-b7be-412b-bce6-f0356eeb5519" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_7bbcc7e7-0ec6-4430-94a6-2086e7367a11" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_7bbcc7e7-0ec6-4430-94a6-2086e7367a11" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_AdjustmentsRelatedToTaxWithholdingAndForfeitedForShareBasedCompensation_b96e0462-838c-4b41-91dd-d55659c69bf0" xlink:href="nnbr-20231231.xsd#nnbr_AdjustmentsRelatedToTaxWithholdingAndForfeitedForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_nnbr_AdjustmentsRelatedToTaxWithholdingAndForfeitedForShareBasedCompensation_b96e0462-838c-4b41-91dd-d55659c69bf0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_5c6c2944-91f9-4f72-aabb-cff00b448f08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_5c6c2944-91f9-4f72-aabb-cff00b448f08" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_1203eb54-890f-46af-9510-cd2c3c215b62" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_1203eb54-890f-46af-9510-cd2c3c215b62" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_94dbab01-a86a-40d6-b9d4-b470b3f608e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_94dbab01-a86a-40d6-b9d4-b470b3f608e9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_109050c0-a8dc-4846-ab32-ea5687104205" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_8746466d-0eeb-4ff5-aca5-5c569eb2b687" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_79a16b85-2e3f-47c9-93b4-76b27f899d14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_NetIncomeLoss_79a16b85-2e3f-47c9-93b4-76b27f899d14" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_ec4b13ae-722e-4c41-9999-ff6530a83802" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_DividendsCommonStockCash_ec4b13ae-722e-4c41-9999-ff6530a83802" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6982bade-cf8a-43f5-8388-62c9b2b0a20b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_c4836de4-0bf1-4c39-9f9a-96483c440f17" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_6982bade-cf8a-43f5-8388-62c9b2b0a20b" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/SignificantAccountingPoliciesAdditionalInformationDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#SignificantAccountingPoliciesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/SignificantAccountingPoliciesAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:href="nnbr-20231231.xsd#nnbr_SignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_01795fee-5144-4328-992a-4a21fc489b19" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:to="loc_us-gaap_StatementTable_01795fee-5144-4328-992a-4a21fc489b19" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ea3e3ef9-c210-407f-a439-71be2f403eb3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01795fee-5144-4328-992a-4a21fc489b19" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ea3e3ef9-c210-407f-a439-71be2f403eb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ea3e3ef9-c210-407f-a439-71be2f403eb3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ea3e3ef9-c210-407f-a439-71be2f403eb3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ea3e3ef9-c210-407f-a439-71be2f403eb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a4637df0-1d86-425a-819e-dada6fee4828" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ea3e3ef9-c210-407f-a439-71be2f403eb3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a4637df0-1d86-425a-819e-dada6fee4828" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_d4344088-7a52-411e-9d0b-9b3e25f4bf09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a4637df0-1d86-425a-819e-dada6fee4828" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_d4344088-7a52-411e-9d0b-9b3e25f4bf09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_9f13ad6a-691f-43cb-b7ad-2f227472190b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a4637df0-1d86-425a-819e-dada6fee4828" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_9f13ad6a-691f-43cb-b7ad-2f227472190b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e7dd99a9-e36d-46de-af1b-053b1c4f294a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01795fee-5144-4328-992a-4a21fc489b19" xlink:to="loc_srt_RangeAxis_e7dd99a9-e36d-46de-af1b-053b1c4f294a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e7dd99a9-e36d-46de-af1b-053b1c4f294a_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e7dd99a9-e36d-46de-af1b-053b1c4f294a" xlink:to="loc_srt_RangeMember_e7dd99a9-e36d-46de-af1b-053b1c4f294a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_73a0d349-889c-45aa-a039-0771f53f87e6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e7dd99a9-e36d-46de-af1b-053b1c4f294a" xlink:to="loc_srt_RangeMember_73a0d349-889c-45aa-a039-0771f53f87e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_651a0a07-c93a-4c56-af98-6534f524c2a8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_73a0d349-889c-45aa-a039-0771f53f87e6" xlink:to="loc_srt_MinimumMember_651a0a07-c93a-4c56-af98-6534f524c2a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_fda495f0-acab-4987-83a9-cd5bb423aea3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_73a0d349-889c-45aa-a039-0771f53f87e6" xlink:to="loc_srt_MaximumMember_fda495f0-acab-4987-83a9-cd5bb423aea3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionAxis_dc503669-51d4-4ab1-88b5-26f7ffccf415" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicDistributionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01795fee-5144-4328-992a-4a21fc489b19" xlink:to="loc_us-gaap_GeographicDistributionAxis_dc503669-51d4-4ab1-88b5-26f7ffccf415" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_dc503669-51d4-4ab1-88b5-26f7ffccf415_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GeographicDistributionAxis_dc503669-51d4-4ab1-88b5-26f7ffccf415" xlink:to="loc_us-gaap_GeographicDistributionDomain_dc503669-51d4-4ab1-88b5-26f7ffccf415_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_c86d5dff-8cbf-45eb-9174-c9aac2774a1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GeographicDistributionAxis_dc503669-51d4-4ab1-88b5-26f7ffccf415" xlink:to="loc_us-gaap_GeographicDistributionDomain_c86d5dff-8cbf-45eb-9174-c9aac2774a1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionForeignMember_5daf0a1c-74b0-4dea-bb03-489819848623" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicDistributionForeignMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeographicDistributionDomain_c86d5dff-8cbf-45eb-9174-c9aac2774a1b" xlink:to="loc_us-gaap_GeographicDistributionForeignMember_5daf0a1c-74b0-4dea-bb03-489819848623" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_NumberOfFacilities_9a1f25f2-592e-4e40-8ddb-34652074eda5" xlink:href="nnbr-20231231.xsd#nnbr_NumberOfFacilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:to="loc_nnbr_NumberOfFacilities_9a1f25f2-592e-4e40-8ddb-34652074eda5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_bb32cd13-045b-4cd9-9b0b-1460c8d0a8a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_bb32cd13-045b-4cd9-9b0b-1460c8d0a8a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_705b6848-8145-4935-8448-a009f108981d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_705b6848-8145-4935-8448-a009f108981d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_32a827b4-40a4-41d9-8d17-e99a2dcdc2e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_32a827b4-40a4-41d9-8d17-e99a2dcdc2e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeFinanceLeaseTermOfContract1_858099c5-00fd-4cb9-83ed-13e0438fe328" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeFinanceLeaseTermOfContract1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:to="loc_us-gaap_LesseeFinanceLeaseTermOfContract1_858099c5-00fd-4cb9-83ed-13e0438fe328" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_0e4caa7d-6b80-40bd-a99b-bfd51a27409c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCurrencyTransactionGainLossRealized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_0e4caa7d-6b80-40bd-a99b-bfd51a27409c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentAssistanceAmount_a8ef7169-d186-46a3-aa39-7525b09064d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GovernmentAssistanceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_SignificantAccountingPoliciesLineItems_fec62a6c-c150-42ff-9430-b66d64328c5f" xlink:to="loc_us-gaap_GovernmentAssistanceAmount_a8ef7169-d186-46a3-aa39-7525b09064d9" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/OperatingSegmentResultsDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#OperatingSegmentResultsDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/OperatingSegmentResultsDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_3918fb04-acab-4f87-ab85-001f27bf11aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_09fcab84-fc8b-4738-9a5e-183226adf7b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3918fb04-acab-4f87-ab85-001f27bf11aa" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_09fcab84-fc8b-4738-9a5e-183226adf7b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_a989aa83-5288-4ac5-8193-a7b3332af337" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_09fcab84-fc8b-4738-9a5e-183226adf7b2" xlink:to="loc_srt_ConsolidationItemsAxis_a989aa83-5288-4ac5-8193-a7b3332af337" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_a989aa83-5288-4ac5-8193-a7b3332af337_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_a989aa83-5288-4ac5-8193-a7b3332af337" xlink:to="loc_srt_ConsolidationItemsDomain_a989aa83-5288-4ac5-8193-a7b3332af337_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_a94b30fd-f12b-4bc6-851b-2405983bbbb2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_a989aa83-5288-4ac5-8193-a7b3332af337" xlink:to="loc_srt_ConsolidationItemsDomain_a94b30fd-f12b-4bc6-851b-2405983bbbb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_582329df-5653-463a-ae20-8668385d45d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a94b30fd-f12b-4bc6-851b-2405983bbbb2" xlink:to="loc_us-gaap_OperatingSegmentsMember_582329df-5653-463a-ae20-8668385d45d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_b414a423-d564-435b-8570-4457844857ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a94b30fd-f12b-4bc6-851b-2405983bbbb2" xlink:to="loc_us-gaap_CorporateNonSegmentMember_b414a423-d564-435b-8570-4457844857ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_2020e113-3a00-4d25-8c82-d21a4465f8c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a94b30fd-f12b-4bc6-851b-2405983bbbb2" xlink:to="loc_us-gaap_IntersegmentEliminationMember_2020e113-3a00-4d25-8c82-d21a4465f8c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6b3a4476-59cb-444d-9995-7729444c555b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_09fcab84-fc8b-4738-9a5e-183226adf7b2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6b3a4476-59cb-444d-9995-7729444c555b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6b3a4476-59cb-444d-9995-7729444c555b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6b3a4476-59cb-444d-9995-7729444c555b" xlink:to="loc_us-gaap_SegmentDomain_6b3a4476-59cb-444d-9995-7729444c555b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_bb735b38-cf38-484b-9690-a8078ccbf3fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6b3a4476-59cb-444d-9995-7729444c555b" xlink:to="loc_us-gaap_SegmentDomain_bb735b38-cf38-484b-9690-a8078ccbf3fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_MobileSolutionsMember_3ba5d0b9-4d99-41f0-85b0-862b8f15e765" xlink:href="nnbr-20231231.xsd#nnbr_MobileSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bb735b38-cf38-484b-9690-a8078ccbf3fb" xlink:to="loc_nnbr_MobileSolutionsMember_3ba5d0b9-4d99-41f0-85b0-862b8f15e765" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_PowerSolutionsMember_1bbff2be-a0b8-413b-a8aa-4813318db1cd" xlink:href="nnbr-20231231.xsd#nnbr_PowerSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_bb735b38-cf38-484b-9690-a8078ccbf3fb" xlink:to="loc_nnbr_PowerSolutionsMember_1bbff2be-a0b8-413b-a8aa-4813318db1cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_65fdd821-1d64-416e-b171-1b117321eed5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_09fcab84-fc8b-4738-9a5e-183226adf7b2" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_65fdd821-1d64-416e-b171-1b117321eed5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_65fdd821-1d64-416e-b171-1b117321eed5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_65fdd821-1d64-416e-b171-1b117321eed5" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_65fdd821-1d64-416e-b171-1b117321eed5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_8a5becf7-f513-47ce-866d-4a7d2bd0ff18" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_65fdd821-1d64-416e-b171-1b117321eed5" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_8a5becf7-f513-47ce-866d-4a7d2bd0ff18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_cf25c3ce-25da-4ebe-ae86-9e03f558eebd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_09fcab84-fc8b-4738-9a5e-183226adf7b2" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_cf25c3ce-25da-4ebe-ae86-9e03f558eebd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_cf25c3ce-25da-4ebe-ae86-9e03f558eebd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_cf25c3ce-25da-4ebe-ae86-9e03f558eebd" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_cf25c3ce-25da-4ebe-ae86-9e03f558eebd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_172d0614-fc3b-4065-b6b2-4be3e88296bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_cf25c3ce-25da-4ebe-ae86-9e03f558eebd" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_172d0614-fc3b-4065-b6b2-4be3e88296bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_24565370-dbda-41b6-80c9-3f7a7f6119a5" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_09fcab84-fc8b-4738-9a5e-183226adf7b2" xlink:to="loc_srt_StatementGeographicalAxis_24565370-dbda-41b6-80c9-3f7a7f6119a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_24565370-dbda-41b6-80c9-3f7a7f6119a5_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_24565370-dbda-41b6-80c9-3f7a7f6119a5" xlink:to="loc_srt_SegmentGeographicalDomain_24565370-dbda-41b6-80c9-3f7a7f6119a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_cd7f85b8-56f0-4df6-8c79-49f10a696808" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_24565370-dbda-41b6-80c9-3f7a7f6119a5" xlink:to="loc_srt_SegmentGeographicalDomain_cd7f85b8-56f0-4df6-8c79-49f10a696808" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_dc52aa86-f92c-41a5-bdb3-8e9dea463995" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementOperatingActivitiesSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_09fcab84-fc8b-4738-9a5e-183226adf7b2" xlink:to="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_dc52aa86-f92c-41a5-bdb3-8e9dea463995" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_dc52aa86-f92c-41a5-bdb3-8e9dea463995_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_dc52aa86-f92c-41a5-bdb3-8e9dea463995" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_dc52aa86-f92c-41a5-bdb3-8e9dea463995_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentOperatingActivitiesDomain_283c1725-597d-45a7-8cea-d26fa237d6db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentOperatingActivitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementOperatingActivitiesSegmentAxis_dc52aa86-f92c-41a5-bdb3-8e9dea463995" xlink:to="loc_us-gaap_SegmentOperatingActivitiesDomain_283c1725-597d-45a7-8cea-d26fa237d6db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_80976219-4355-405e-8f6f-cc3ea6e48e31" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3918fb04-acab-4f87-ab85-001f27bf11aa" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_80976219-4355-405e-8f6f-cc3ea6e48e31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c96428e7-4233-4a5a-962b-7f027e7a2860" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3918fb04-acab-4f87-ab85-001f27bf11aa" xlink:to="loc_us-gaap_OperatingIncomeLoss_c96428e7-4233-4a5a-962b-7f027e7a2860" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_75c18ad7-3c98-414f-a2e4-ae47bcb278f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3918fb04-acab-4f87-ab85-001f27bf11aa" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_75c18ad7-3c98-414f-a2e4-ae47bcb278f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_abc17c42-a01e-4b72-8354-9ed0bd35c7ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3918fb04-acab-4f87-ab85-001f27bf11aa" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_abc17c42-a01e-4b72-8354-9ed0bd35c7ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_0390428b-c3e6-4845-bf85-52c881b65867" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3918fb04-acab-4f87-ab85-001f27bf11aa" xlink:to="loc_us-gaap_Assets_0390428b-c3e6-4845-bf85-52c881b65867" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_f6572425-d329-400a-b039-9213e2780bb5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_3918fb04-acab-4f87-ab85-001f27bf11aa" xlink:to="loc_us-gaap_EquityMethodInvestments_f6572425-d329-400a-b039-9213e2780bb5" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/AssetsandRevenuebyGeographyDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#AssetsandRevenuebyGeographyDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/AssetsandRevenuebyGeographyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_e5e9b07a-64f8-4e87-a166-1472edd93bc4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_180cf931-701d-4835-8208-f7082101d965" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_e5e9b07a-64f8-4e87-a166-1472edd93bc4" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_180cf931-701d-4835-8208-f7082101d965" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_cc8366df-8955-4734-84ca-d6c80be3a75b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_180cf931-701d-4835-8208-f7082101d965" xlink:to="loc_srt_StatementGeographicalAxis_cc8366df-8955-4734-84ca-d6c80be3a75b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_cc8366df-8955-4734-84ca-d6c80be3a75b_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_cc8366df-8955-4734-84ca-d6c80be3a75b" xlink:to="loc_srt_SegmentGeographicalDomain_cc8366df-8955-4734-84ca-d6c80be3a75b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_cc8366df-8955-4734-84ca-d6c80be3a75b" xlink:to="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_850dd092-4f4b-47f2-a00c-435dd54bd156" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_country_US_850dd092-4f4b-47f2-a00c-435dd54bd156" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_ba16053a-c400-4e3c-843d-b598fa957b2f" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_country_CN_ba16053a-c400-4e3c-843d-b598fa957b2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_BR_7764b84e-cf49-445c-a9e1-948cd89f695d" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_BR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_country_BR_7764b84e-cf49-445c-a9e1-948cd89f695d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_9835a661-9138-44da-97aa-f20d2e768c9b" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_country_MX_9835a661-9138-44da-97aa-f20d2e768c9b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE_efef6eba-83c4-48a4-ac3b-deb9a4ad31f4" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_country_DE_efef6eba-83c4-48a4-ac3b-deb9a4ad31f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_PL_5dfdec96-7158-41f6-a9b3-f7932027dd2f" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_PL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_country_PL_5dfdec96-7158-41f6-a9b3-f7932027dd2f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_OtherCountryMember_7b4d24c3-446b-442a-ba24-a38572bff90c" xlink:href="nnbr-20231231.xsd#nnbr_OtherCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_nnbr_OtherCountryMember_7b4d24c3-446b-442a-ba24-a38572bff90c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_b4c4b32a-9b1c-49cd-9c06-7898bad3d8cc" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_FR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_country_FR_b4c4b32a-9b1c-49cd-9c06-7898bad3d8cc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionForeignMember_3c9ac6c1-c39b-4dbe-8b7c-5ea315cc4b71" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicDistributionForeignMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e2e191d6-d92c-4a5a-b694-5543bcb1e228" xlink:to="loc_us-gaap_GeographicDistributionForeignMember_3c9ac6c1-c39b-4dbe-8b7c-5ea315cc4b71" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_81c0830b-07ab-4261-a19f-c5c49b333a9a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_e5e9b07a-64f8-4e87-a166-1472edd93bc4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_81c0830b-07ab-4261-a19f-c5c49b333a9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_b8e76d76-fb45-43f9-a512-e7c4e34e0bc4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_e5e9b07a-64f8-4e87-a166-1472edd93bc4" xlink:to="loc_us-gaap_NoncurrentAssets_b8e76d76-fb45-43f9-a512-e7c4e34e0bc4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/RevenuefromContractswithCustomersSummaryofSalestoExternalCustomerbyOperatingSegmentDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#RevenuefromContractswithCustomersSummaryofSalestoExternalCustomerbyOperatingSegmentDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/RevenuefromContractswithCustomersSummaryofSalestoExternalCustomerbyOperatingSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_b64c00c6-6017-4df2-adaf-08ecd32da4e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_b31a1d89-8342-4f28-9fcb-1ece563ddb33" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_b64c00c6-6017-4df2-adaf-08ecd32da4e5" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_b31a1d89-8342-4f28-9fcb-1ece563ddb33" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_ce09e738-7b14-442b-a52b-338439d3ff1d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b31a1d89-8342-4f28-9fcb-1ece563ddb33" xlink:to="loc_srt_ConsolidationItemsAxis_ce09e738-7b14-442b-a52b-338439d3ff1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_ce09e738-7b14-442b-a52b-338439d3ff1d_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_ce09e738-7b14-442b-a52b-338439d3ff1d" xlink:to="loc_srt_ConsolidationItemsDomain_ce09e738-7b14-442b-a52b-338439d3ff1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_2a916f41-157a-46d7-9ba6-f09db5978170" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_ce09e738-7b14-442b-a52b-338439d3ff1d" xlink:to="loc_srt_ConsolidationItemsDomain_2a916f41-157a-46d7-9ba6-f09db5978170" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_63fc26d3-e362-4147-b1d3-41add22c89b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_2a916f41-157a-46d7-9ba6-f09db5978170" xlink:to="loc_us-gaap_IntersegmentEliminationMember_63fc26d3-e362-4147-b1d3-41add22c89b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_0f0dbabb-7f08-40af-8e08-4a127375ab68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_2a916f41-157a-46d7-9ba6-f09db5978170" xlink:to="loc_us-gaap_OperatingSegmentsMember_0f0dbabb-7f08-40af-8e08-4a127375ab68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_f9e71029-a72d-48f1-89a9-ceac7f2f2cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b31a1d89-8342-4f28-9fcb-1ece563ddb33" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_f9e71029-a72d-48f1-89a9-ceac7f2f2cb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f9e71029-a72d-48f1-89a9-ceac7f2f2cb5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f9e71029-a72d-48f1-89a9-ceac7f2f2cb5" xlink:to="loc_us-gaap_SegmentDomain_f9e71029-a72d-48f1-89a9-ceac7f2f2cb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d40032b3-3ac5-4f3c-8b2a-697a4207e725" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f9e71029-a72d-48f1-89a9-ceac7f2f2cb5" xlink:to="loc_us-gaap_SegmentDomain_d40032b3-3ac5-4f3c-8b2a-697a4207e725" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_MobileSolutionsMember_eeed6ec4-d660-470f-8167-253bb1f49dd0" xlink:href="nnbr-20231231.xsd#nnbr_MobileSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d40032b3-3ac5-4f3c-8b2a-697a4207e725" xlink:to="loc_nnbr_MobileSolutionsMember_eeed6ec4-d660-470f-8167-253bb1f49dd0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_PowerSolutionsMember_67ceb0eb-2c3c-4f6d-bc49-d815dba60a09" xlink:href="nnbr-20231231.xsd#nnbr_PowerSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d40032b3-3ac5-4f3c-8b2a-697a4207e725" xlink:to="loc_nnbr_PowerSolutionsMember_67ceb0eb-2c3c-4f6d-bc49-d815dba60a09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_9fb8b954-6e6e-4efe-88e0-b2e7da3a1635" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b31a1d89-8342-4f28-9fcb-1ece563ddb33" xlink:to="loc_srt_StatementGeographicalAxis_9fb8b954-6e6e-4efe-88e0-b2e7da3a1635" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_9fb8b954-6e6e-4efe-88e0-b2e7da3a1635_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_9fb8b954-6e6e-4efe-88e0-b2e7da3a1635" xlink:to="loc_srt_SegmentGeographicalDomain_9fb8b954-6e6e-4efe-88e0-b2e7da3a1635_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_9fb8b954-6e6e-4efe-88e0-b2e7da3a1635" xlink:to="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_05c103c7-1f9e-4349-a33b-36789f056860" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:to="loc_country_US_05c103c7-1f9e-4349-a33b-36789f056860" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_999ad396-9861-454f-83d2-8457c581efd6" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:to="loc_country_CN_999ad396-9861-454f-83d2-8457c581efd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_BR_e9183b86-168a-4a0a-a757-25770ee7c6f5" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_BR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:to="loc_country_BR_e9183b86-168a-4a0a-a757-25770ee7c6f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_cbd719de-b943-4133-9b8a-4ba5b1412901" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:to="loc_country_MX_cbd719de-b943-4133-9b8a-4ba5b1412901" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE_33b6a35f-5fda-47da-a57c-c0775c60c37d" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:to="loc_country_DE_33b6a35f-5fda-47da-a57c-c0775c60c37d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_PL_8c479290-9dce-4651-a2df-3004c5ca1394" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_PL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:to="loc_country_PL_8c479290-9dce-4651-a2df-3004c5ca1394" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_OtherCountryMember_26636ef8-4f1d-4369-b895-a3a772f36b3a" xlink:href="nnbr-20231231.xsd#nnbr_OtherCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2d5c787c-04bc-4791-827c-084c479b72bb" xlink:to="loc_nnbr_OtherCountryMember_26636ef8-4f1d-4369-b895-a3a772f36b3a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_bdc10c74-de2c-4f00-939b-8d5db5c5f56a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_b31a1d89-8342-4f28-9fcb-1ece563ddb33" xlink:to="loc_srt_ProductOrServiceAxis_bdc10c74-de2c-4f00-939b-8d5db5c5f56a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bdc10c74-de2c-4f00-939b-8d5db5c5f56a_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_bdc10c74-de2c-4f00-939b-8d5db5c5f56a" xlink:to="loc_srt_ProductsAndServicesDomain_bdc10c74-de2c-4f00-939b-8d5db5c5f56a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f49d1709-80b1-49d6-9ad4-5d32c2d85551" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_bdc10c74-de2c-4f00-939b-8d5db5c5f56a" xlink:to="loc_srt_ProductsAndServicesDomain_f49d1709-80b1-49d6-9ad4-5d32c2d85551" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_AutomotiveMember_cf9f3117-b817-4090-8aca-9542f7482392" xlink:href="nnbr-20231231.xsd#nnbr_AutomotiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f49d1709-80b1-49d6-9ad4-5d32c2d85551" xlink:to="loc_nnbr_AutomotiveMember_cf9f3117-b817-4090-8aca-9542f7482392" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_GeneralIndustrialMember_61c523bf-9d02-4a9c-a2a7-603c47171a9e" xlink:href="nnbr-20231231.xsd#nnbr_GeneralIndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f49d1709-80b1-49d6-9ad4-5d32c2d85551" xlink:to="loc_nnbr_GeneralIndustrialMember_61c523bf-9d02-4a9c-a2a7-603c47171a9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ElectricalMember_d81aef71-22bb-4612-aa2d-6ad97c15b12b" xlink:href="nnbr-20231231.xsd#nnbr_ElectricalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f49d1709-80b1-49d6-9ad4-5d32c2d85551" xlink:to="loc_nnbr_ElectricalMember_d81aef71-22bb-4612-aa2d-6ad97c15b12b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_OtherEndMarketMember_5fe8a0a3-1edf-4d88-aacd-399dbe7a9a1a" xlink:href="nnbr-20231231.xsd#nnbr_OtherEndMarketMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_f49d1709-80b1-49d6-9ad4-5d32c2d85551" xlink:to="loc_nnbr_OtherEndMarketMember_5fe8a0a3-1edf-4d88-aacd-399dbe7a9a1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_596c5e51-1747-48f0-a6f3-eb72a598c1e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_b64c00c6-6017-4df2-adaf-08ecd32da4e5" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_596c5e51-1747-48f0-a6f3-eb72a598c1e2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/RevenuefromContractswithCustomersAdditionalInformationDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#RevenuefromContractswithCustomersAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/RevenuefromContractswithCustomersAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_ab9f59b4-9f0d-4cc6-bf05-3e90af1c6c70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_233846e6-5121-4797-96e2-b62ee818c970" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_ab9f59b4-9f0d-4cc6-bf05-3e90af1c6c70" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_233846e6-5121-4797-96e2-b62ee818c970" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_41ea99f7-e024-45cb-bf4b-0ad37f3e3eef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_233846e6-5121-4797-96e2-b62ee818c970" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_41ea99f7-e024-45cb-bf4b-0ad37f3e3eef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_41ea99f7-e024-45cb-bf4b-0ad37f3e3eef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_41ea99f7-e024-45cb-bf4b-0ad37f3e3eef" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_41ea99f7-e024-45cb-bf4b-0ad37f3e3eef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_4e154ae6-165a-4113-bbf7-3b4ba52be03a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_41ea99f7-e024-45cb-bf4b-0ad37f3e3eef" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_4e154ae6-165a-4113-bbf7-3b4ba52be03a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_cf8860d8-bfba-4b0f-89fa-9b35816a42d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_4e154ae6-165a-4113-bbf7-3b4ba52be03a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_cf8860d8-bfba-4b0f-89fa-9b35816a42d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_3319557a-69da-4cdb-958d-4184ee0dcb69" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_233846e6-5121-4797-96e2-b62ee818c970" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_3319557a-69da-4cdb-958d-4184ee0dcb69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_3319557a-69da-4cdb-958d-4184ee0dcb69_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_3319557a-69da-4cdb-958d-4184ee0dcb69" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_3319557a-69da-4cdb-958d-4184ee0dcb69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_eb53c974-f1a1-4215-a613-d0fe5d843eed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_3319557a-69da-4cdb-958d-4184ee0dcb69" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_eb53c974-f1a1-4215-a613-d0fe5d843eed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_fd6f769e-efe2-48ba-a8a4-7d8f5940b80b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_eb53c974-f1a1-4215-a613-d0fe5d843eed" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_fd6f769e-efe2-48ba-a8a4-7d8f5940b80b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_ed4832de-9188-4b41-a215-0b57a7d220b1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_233846e6-5121-4797-96e2-b62ee818c970" xlink:to="loc_srt_MajorCustomersAxis_ed4832de-9188-4b41-a215-0b57a7d220b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_ed4832de-9188-4b41-a215-0b57a7d220b1_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_ed4832de-9188-4b41-a215-0b57a7d220b1" xlink:to="loc_srt_NameOfMajorCustomerDomain_ed4832de-9188-4b41-a215-0b57a7d220b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_755e4074-bdb7-44d7-ad3e-1bfd613c0f96" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_ed4832de-9188-4b41-a215-0b57a7d220b1" xlink:to="loc_srt_NameOfMajorCustomerDomain_755e4074-bdb7-44d7-ad3e-1bfd613c0f96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_MajorCustomerMember_d56d6924-0ae4-4bc4-972b-835d23c0ac1a" xlink:href="nnbr-20231231.xsd#nnbr_MajorCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_755e4074-bdb7-44d7-ad3e-1bfd613c0f96" xlink:to="loc_nnbr_MajorCustomerMember_d56d6924-0ae4-4bc4-972b-835d23c0ac1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e69724a0-f83d-475a-93f5-bad674efc3c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_ab9f59b4-9f0d-4cc6-bf05-3e90af1c6c70" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e69724a0-f83d-475a-93f5-bad674efc3c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_f8fe5dd6-07c4-4c6e-bbeb-531fc9864a20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_ab9f59b4-9f0d-4cc6-bf05-3e90af1c6c70" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_f8fe5dd6-07c4-4c6e-bbeb-531fc9864a20" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/AccountsReceivableAdditionalInformationDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#AccountsReceivableAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/AccountsReceivableAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_be4d207c-a205-4ea8-8b42-c4e087823123" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_ee5e8c25-40fe-4cfc-a58f-9b88f7012812" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_be4d207c-a205-4ea8-8b42-c4e087823123" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_ee5e8c25-40fe-4cfc-a58f-9b88f7012812" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c4dc3287-3482-4ad2-9c9e-e84109c73d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_ee5e8c25-40fe-4cfc-a58f-9b88f7012812" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c4dc3287-3482-4ad2-9c9e-e84109c73d3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c4dc3287-3482-4ad2-9c9e-e84109c73d3f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c4dc3287-3482-4ad2-9c9e-e84109c73d3f" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c4dc3287-3482-4ad2-9c9e-e84109c73d3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_36eaec5d-8db9-425f-87d8-be6f5d280f53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_c4dc3287-3482-4ad2-9c9e-e84109c73d3f" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_36eaec5d-8db9-425f-87d8-be6f5d280f53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_2ece072f-f845-4e3a-b722-7e5b0bf422da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_36eaec5d-8db9-425f-87d8-be6f5d280f53" xlink:to="loc_us-gaap_AccountsReceivableMember_2ece072f-f845-4e3a-b722-7e5b0bf422da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_b65aa8b4-722d-49ae-938c-e6275c81d959" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_ee5e8c25-40fe-4cfc-a58f-9b88f7012812" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_b65aa8b4-722d-49ae-938c-e6275c81d959" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b65aa8b4-722d-49ae-938c-e6275c81d959_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b65aa8b4-722d-49ae-938c-e6275c81d959" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b65aa8b4-722d-49ae-938c-e6275c81d959_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_13a0cfc7-c380-4c3e-a82a-23a4862c3b94" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b65aa8b4-722d-49ae-938c-e6275c81d959" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_13a0cfc7-c380-4c3e-a82a-23a4862c3b94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditConcentrationRiskMember_4c845e8d-49ea-42c5-9b5d-aaee20945af8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_13a0cfc7-c380-4c3e-a82a-23a4862c3b94" xlink:to="loc_us-gaap_CreditConcentrationRiskMember_4c845e8d-49ea-42c5-9b5d-aaee20945af8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_4bf4adaf-1eab-4ba6-9891-70a44f944288" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_ee5e8c25-40fe-4cfc-a58f-9b88f7012812" xlink:to="loc_srt_MajorCustomersAxis_4bf4adaf-1eab-4ba6-9891-70a44f944288" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_4bf4adaf-1eab-4ba6-9891-70a44f944288_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_4bf4adaf-1eab-4ba6-9891-70a44f944288" xlink:to="loc_srt_NameOfMajorCustomerDomain_4bf4adaf-1eab-4ba6-9891-70a44f944288_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_4751689a-2826-4ae2-acfa-41e0de9b701f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_4bf4adaf-1eab-4ba6-9891-70a44f944288" xlink:to="loc_srt_NameOfMajorCustomerDomain_4751689a-2826-4ae2-acfa-41e0de9b701f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_MajorCustomerMember_18c66dcf-6cbe-49be-bed3-788b4ee4b4be" xlink:href="nnbr-20231231.xsd#nnbr_MajorCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_4751689a-2826-4ae2-acfa-41e0de9b701f" xlink:to="loc_nnbr_MajorCustomerMember_18c66dcf-6cbe-49be-bed3-788b4ee4b4be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_41983298-4bf8-4d60-82f8-8311f0f5e4d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_be4d207c-a205-4ea8-8b42-c4e087823123" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_41983298-4bf8-4d60-82f8-8311f0f5e4d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSecuritizationOfFinancialAssets_aba6b36e-3a5d-4f06-8edf-d9a0031352d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnSecuritizationOfFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_be4d207c-a205-4ea8-8b42-c4e087823123" xlink:to="loc_us-gaap_GainLossOnSecuritizationOfFinancialAssets_aba6b36e-3a5d-4f06-8edf-d9a0031352d8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/PropertyPlantandEquipmentSummaryofPropertyPlantandEquipmentDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#PropertyPlantandEquipmentSummaryofPropertyPlantandEquipmentDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/PropertyPlantandEquipmentSummaryofPropertyPlantandEquipmentDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_184b1e74-6791-4c35-918a-f7024669f9d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_81728a1a-e099-4d7b-a304-a4edb09cc5f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_184b1e74-6791-4c35-918a-f7024669f9d9" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_81728a1a-e099-4d7b-a304-a4edb09cc5f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ad31f7d7-9d2b-4a35-8dea-e30c00337886" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_81728a1a-e099-4d7b-a304-a4edb09cc5f8" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ad31f7d7-9d2b-4a35-8dea-e30c00337886" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ad31f7d7-9d2b-4a35-8dea-e30c00337886_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ad31f7d7-9d2b-4a35-8dea-e30c00337886" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_ad31f7d7-9d2b-4a35-8dea-e30c00337886_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_d8ed1437-0af5-48c3-bded-f7d45994f173" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_ad31f7d7-9d2b-4a35-8dea-e30c00337886" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_d8ed1437-0af5-48c3-bded-f7d45994f173" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandAndBuildingMember_ef9b2831-05b4-432e-9a60-6f2131543850" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandAndBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_d8ed1437-0af5-48c3-bded-f7d45994f173" xlink:to="loc_us-gaap_LandAndBuildingMember_ef9b2831-05b4-432e-9a60-6f2131543850" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_e9ee1f9d-9e49-45a8-99a1-81bb17973ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_d8ed1437-0af5-48c3-bded-f7d45994f173" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_e9ee1f9d-9e49-45a8-99a1-81bb17973ff0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_56ba9bbf-afb6-4190-907e-fa0f6b8b91c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_d8ed1437-0af5-48c3-bded-f7d45994f173" xlink:to="loc_us-gaap_ConstructionInProgressMember_56ba9bbf-afb6-4190-907e-fa0f6b8b91c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_e4c1dbe8-8780-4a71-8c6d-7bfeec7a964b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_184b1e74-6791-4c35-918a-f7024669f9d9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_e4c1dbe8-8780-4a71-8c6d-7bfeec7a964b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_6065d687-a0be-4931-b427-a942100ceb15" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_184b1e74-6791-4c35-918a-f7024669f9d9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_6065d687-a0be-4931-b427-a942100ceb15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_5a6f7e4f-5d5c-4f31-86a3-242a71f66304" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_184b1e74-6791-4c35-918a-f7024669f9d9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_5a6f7e4f-5d5c-4f31-86a3-242a71f66304" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/IntangibleAssetsNetSummaryofCarryingAmountofIntangibleAssetsbySegmentDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#IntangibleAssetsNetSummaryofCarryingAmountofIntangibleAssetsbySegmentDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/IntangibleAssetsNetSummaryofCarryingAmountofIntangibleAssetsbySegmentDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_375e6b7e-7768-41a9-bc9e-fccc7daabb05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_7271e6f1-35f3-4a2d-a0ad-7c8779c876a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_375e6b7e-7768-41a9-bc9e-fccc7daabb05" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_7271e6f1-35f3-4a2d-a0ad-7c8779c876a1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_54b925f8-1d8d-4468-b386-4b8d6dccdcfe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_7271e6f1-35f3-4a2d-a0ad-7c8779c876a1" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_54b925f8-1d8d-4468-b386-4b8d6dccdcfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_54b925f8-1d8d-4468-b386-4b8d6dccdcfe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_54b925f8-1d8d-4468-b386-4b8d6dccdcfe" xlink:to="loc_us-gaap_SegmentDomain_54b925f8-1d8d-4468-b386-4b8d6dccdcfe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_69a4c2b9-0ff9-4940-aa33-bcfdc4d496b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_54b925f8-1d8d-4468-b386-4b8d6dccdcfe" xlink:to="loc_us-gaap_SegmentDomain_69a4c2b9-0ff9-4940-aa33-bcfdc4d496b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_MobileSolutionsMember_769655ad-d716-445a-9a31-5574b94a0869" xlink:href="nnbr-20231231.xsd#nnbr_MobileSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_69a4c2b9-0ff9-4940-aa33-bcfdc4d496b1" xlink:to="loc_nnbr_MobileSolutionsMember_769655ad-d716-445a-9a31-5574b94a0869" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_PowerSolutionsMember_bd5872fd-efd6-4780-8f0c-4c3c5c7143af" xlink:href="nnbr-20231231.xsd#nnbr_PowerSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_69a4c2b9-0ff9-4940-aa33-bcfdc4d496b1" xlink:to="loc_nnbr_PowerSolutionsMember_bd5872fd-efd6-4780-8f0c-4c3c5c7143af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_61182e19-9b68-4233-adef-bf33347ef96e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_375e6b7e-7768-41a9-bc9e-fccc7daabb05" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_61182e19-9b68-4233-adef-bf33347ef96e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_2f5c5059-de9b-4c29-aeea-31b396445685" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_375e6b7e-7768-41a9-bc9e-fccc7daabb05" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_2f5c5059-de9b-4c29-aeea-31b396445685" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_283aac44-8965-4468-9dcb-614f003cc6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/IntangibleAssetsNetSummaryofCarryingAmountofIntangibleAssetsbyMajorAssetClassDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#IntangibleAssetsNetSummaryofCarryingAmountofIntangibleAssetsbyMajorAssetClassDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/IntangibleAssetsNetSummaryofCarryingAmountofIntangibleAssetsbyMajorAssetClassDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_e9731bea-1417-4739-9412-c34b8be34e09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_af8a3a3b-5402-4a25-b32b-0ace4a1310cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_e9731bea-1417-4739-9412-c34b8be34e09" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_af8a3a3b-5402-4a25-b32b-0ace4a1310cb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c4a01c4a-4427-44de-bfea-92f9e2a50c98" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_af8a3a3b-5402-4a25-b32b-0ace4a1310cb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c4a01c4a-4427-44de-bfea-92f9e2a50c98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c4a01c4a-4427-44de-bfea-92f9e2a50c98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c4a01c4a-4427-44de-bfea-92f9e2a50c98" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c4a01c4a-4427-44de-bfea-92f9e2a50c98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1cee0e85-2811-432a-84d7-b18d69c85931" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c4a01c4a-4427-44de-bfea-92f9e2a50c98" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1cee0e85-2811-432a-84d7-b18d69c85931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_9d32bdaa-2dd2-4671-b885-ca84e7b41f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1cee0e85-2811-432a-84d7-b18d69c85931" xlink:to="loc_us-gaap_CustomerRelationshipsMember_9d32bdaa-2dd2-4671-b885-ca84e7b41f7c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_bdb45c54-2aee-4938-97f3-fe2242f12b7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1cee0e85-2811-432a-84d7-b18d69c85931" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_bdb45c54-2aee-4938-97f3-fe2242f12b7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e2e18fef-ae24-42bb-ba51-a58dc75d2ee8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_af8a3a3b-5402-4a25-b32b-0ace4a1310cb" xlink:to="loc_srt_RangeAxis_e2e18fef-ae24-42bb-ba51-a58dc75d2ee8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e2e18fef-ae24-42bb-ba51-a58dc75d2ee8_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e2e18fef-ae24-42bb-ba51-a58dc75d2ee8" xlink:to="loc_srt_RangeMember_e2e18fef-ae24-42bb-ba51-a58dc75d2ee8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f0aed8ee-67ee-4f86-bf5f-d07271ea6945" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e2e18fef-ae24-42bb-ba51-a58dc75d2ee8" xlink:to="loc_srt_RangeMember_f0aed8ee-67ee-4f86-bf5f-d07271ea6945" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_bd0d9bed-d682-408a-9114-40b99d590471" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f0aed8ee-67ee-4f86-bf5f-d07271ea6945" xlink:to="loc_srt_MinimumMember_bd0d9bed-d682-408a-9114-40b99d590471" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_0be49ee2-9464-4406-8384-28268a3d8f7a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f0aed8ee-67ee-4f86-bf5f-d07271ea6945" xlink:to="loc_srt_MaximumMember_0be49ee2-9464-4406-8384-28268a3d8f7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_15afeeda-7d93-43e3-9f6c-8ea32bab5344" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_e9731bea-1417-4739-9412-c34b8be34e09" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_15afeeda-7d93-43e3-9f6c-8ea32bab5344" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_7c306ac2-cd39-449f-9c46-db85dd20d819" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_e9731bea-1417-4739-9412-c34b8be34e09" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_7c306ac2-cd39-449f-9c46-db85dd20d819" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_e7797b54-0484-4213-ac7a-daf97f54a6a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_e9731bea-1417-4739-9412-c34b8be34e09" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_e7797b54-0484-4213-ac7a-daf97f54a6a2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/InvestmentinJointVentureSummarizedActivityRelatedtoInvestmentinJointVentureDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#InvestmentinJointVentureSummarizedActivityRelatedtoInvestmentinJointVentureDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/InvestmentinJointVentureSummarizedActivityRelatedtoInvestmentinJointVentureDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_a1e8a1fa-1941-4650-a078-9f25d06fa34c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_c723a6cd-67e1-4097-a268-cd9d24282f71" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_a1e8a1fa-1941-4650-a078-9f25d06fa34c" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_c723a6cd-67e1-4097-a268-cd9d24282f71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e9ea5bd4-fe84-4428-a746-22aaba4a0008" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_c723a6cd-67e1-4097-a268-cd9d24282f71" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e9ea5bd4-fe84-4428-a746-22aaba4a0008" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_e9ea5bd4-fe84-4428-a746-22aaba4a0008_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e9ea5bd4-fe84-4428-a746-22aaba4a0008" xlink:to="loc_us-gaap_RelatedPartyDomain_e9ea5bd4-fe84-4428-a746-22aaba4a0008_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_20a11432-e4e1-43d7-a5a0-9801cdcb4d04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e9ea5bd4-fe84-4428-a746-22aaba4a0008" xlink:to="loc_us-gaap_RelatedPartyDomain_20a11432-e4e1-43d7-a5a0-9801cdcb4d04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateJointVentureMember_0cee2b88-3534-47af-af53-5a53d3f2b63e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_20a11432-e4e1-43d7-a5a0-9801cdcb4d04" xlink:to="loc_us-gaap_CorporateJointVentureMember_0cee2b88-3534-47af-af53-5a53d3f2b63e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_750a7af6-1f2a-44d0-8547-9b65bc0352ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_a1e8a1fa-1941-4650-a078-9f25d06fa34c" xlink:to="loc_us-gaap_EquityMethodInvestments_750a7af6-1f2a-44d0-8547-9b65bc0352ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_bc77409e-fada-4664-bed7-aa7ed0ee89f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_a1e8a1fa-1941-4650-a078-9f25d06fa34c" xlink:to="loc_us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital_bc77409e-fada-4664-bed7-aa7ed0ee89f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_EquityMethodInvestmentForeignCurrencyTranslationGain_4077588a-828c-459f-b67d-56858bc75170" xlink:href="nnbr-20231231.xsd#nnbr_EquityMethodInvestmentForeignCurrencyTranslationGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_a1e8a1fa-1941-4650-a078-9f25d06fa34c" xlink:to="loc_nnbr_EquityMethodInvestmentForeignCurrencyTranslationGain_4077588a-828c-459f-b67d-56858bc75170" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_f8d75d8f-d0c6-417a-9e41-88a423e9587b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_a1e8a1fa-1941-4650-a078-9f25d06fa34c" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_f8d75d8f-d0c6-417a-9e41-88a423e9587b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_56a337b1-3160-40f7-bd2e-edaa98c55941" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestments"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/SummarizedFinancialInformationDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#SummarizedFinancialInformationDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/SummarizedFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5ff8ae1b-97b8-48e3-aaab-4cca0dfd2d04" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5ff8ae1b-97b8-48e3-aaab-4cca0dfd2d04" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_be03bea4-617b-4045-8187-215f2066b1e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5ff8ae1b-97b8-48e3-aaab-4cca0dfd2d04" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_be03bea4-617b-4045-8187-215f2066b1e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_be03bea4-617b-4045-8187-215f2066b1e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_be03bea4-617b-4045-8187-215f2066b1e6" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_be03bea4-617b-4045-8187-215f2066b1e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_21cfed79-36e3-4eff-bed6-f61a80b39b55" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_be03bea4-617b-4045-8187-215f2066b1e6" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_21cfed79-36e3-4eff-bed6-f61a80b39b55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember_54022914-6f4b-4ba5-bf09-6afa0cc1d31b" xlink:href="nnbr-20231231.xsd#nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_21cfed79-36e3-4eff-bed6-f61a80b39b55" xlink:to="loc_nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember_54022914-6f4b-4ba5-bf09-6afa0cc1d31b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5184d0b5-6949-4263-a380-d417d65c65f8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_5ff8ae1b-97b8-48e3-aaab-4cca0dfd2d04" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5184d0b5-6949-4263-a380-d417d65c65f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_5184d0b5-6949-4263-a380-d417d65c65f8_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5184d0b5-6949-4263-a380-d417d65c65f8" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_5184d0b5-6949-4263-a380-d417d65c65f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_749e13c9-294b-4961-84cb-e04b7a6ee46c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5184d0b5-6949-4263-a380-d417d65c65f8" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_749e13c9-294b-4961-84cb-e04b7a6ee46c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember_c709e709-fe75-4715-9bfa-a4b9b4238c73" xlink:href="nnbr-20231231.xsd#nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_749e13c9-294b-4961-84cb-e04b7a6ee46c" xlink:to="loc_nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember_c709e709-fe75-4715-9bfa-a4b9b4238c73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_0265fba1-170a-4168-82cc-e0c3410e10ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_Revenues_0265fba1-170a-4168-82cc-e0c3410e10ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_f8319658-841b-4d1c-a16b-9ea148e0fa3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_CostOfRevenue_f8319658-841b-4d1c-a16b-9ea148e0fa3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_38bdbbba-1c9a-47ae-a017-822ea526d6ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_OperatingIncomeLoss_38bdbbba-1c9a-47ae-a017-822ea526d6ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_d6530a15-e9ed-4d7e-a24a-6c97b5d95b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_ProfitLoss_d6530a15-e9ed-4d7e-a24a-6c97b5d95b4e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_ec983405-d4c5-4c89-8d71-5c02f92ae5f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_AssetsCurrent_ec983405-d4c5-4c89-8d71-5c02f92ae5f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrent_9ba2990d-b4bf-4ad9-ab14-8af2d657bd30" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_AssetsNoncurrent_9ba2990d-b4bf-4ad9-ab14-8af2d657bd30" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_858f8e9b-2a0e-481d-85a2-d0c72e9b5c28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_LiabilitiesCurrent_858f8e9b-2a0e-481d-85a2-d0c72e9b5c28" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_6379945f-17a4-4b6e-a21b-8ac2cc205760" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_2a2b839f-f9b6-4c9a-bf7c-f6f8977170be" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_6379945f-17a4-4b6e-a21b-8ac2cc205760" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/InvestmentinJointVentureAdditionalInformationDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#InvestmentinJointVentureAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/InvestmentinJointVentureAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4df8b24d-1fc8-4cd8-a27e-d25f1573702e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_070c4225-9a3f-4948-8a30-56c684151eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4df8b24d-1fc8-4cd8-a27e-d25f1573702e" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_070c4225-9a3f-4948-8a30-56c684151eb4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_dd9345eb-6ce6-4d3b-bebc-e4e82de59015" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_070c4225-9a3f-4948-8a30-56c684151eb4" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_dd9345eb-6ce6-4d3b-bebc-e4e82de59015" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_dd9345eb-6ce6-4d3b-bebc-e4e82de59015_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_dd9345eb-6ce6-4d3b-bebc-e4e82de59015" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_dd9345eb-6ce6-4d3b-bebc-e4e82de59015_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_7df8ee25-9a85-431b-a391-1bcef8e286a0" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_dd9345eb-6ce6-4d3b-bebc-e4e82de59015" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_7df8ee25-9a85-431b-a391-1bcef8e286a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember_74955b3c-6381-4d35-96a1-f35c2ff09212" xlink:href="nnbr-20231231.xsd#nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_7df8ee25-9a85-431b-a391-1bcef8e286a0" xlink:to="loc_nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember_74955b3c-6381-4d35-96a1-f35c2ff09212" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_967ffa39-02a3-48c6-9a6a-69e18b2c5d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_070c4225-9a3f-4948-8a30-56c684151eb4" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_967ffa39-02a3-48c6-9a6a-69e18b2c5d3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_967ffa39-02a3-48c6-9a6a-69e18b2c5d3f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_967ffa39-02a3-48c6-9a6a-69e18b2c5d3f" xlink:to="loc_us-gaap_RelatedPartyDomain_967ffa39-02a3-48c6-9a6a-69e18b2c5d3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_1841fb0f-0f84-400c-bf07-4966555e8df0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_967ffa39-02a3-48c6-9a6a-69e18b2c5d3f" xlink:to="loc_us-gaap_RelatedPartyDomain_1841fb0f-0f84-400c-bf07-4966555e8df0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateJointVentureMember_47148b84-c232-498d-b78c-762233644162" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateJointVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_1841fb0f-0f84-400c-bf07-4966555e8df0" xlink:to="loc_us-gaap_CorporateJointVentureMember_47148b84-c232-498d-b78c-762233644162" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_f6eba096-3314-4402-b4b9-464fba6bb928" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_1841fb0f-0f84-400c-bf07-4966555e8df0" xlink:to="loc_us-gaap_RelatedPartyMember_f6eba096-3314-4402-b4b9-464fba6bb928" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_7552b5c3-131b-482c-bd09-dd2168090ddb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_070c4225-9a3f-4948-8a30-56c684151eb4" xlink:to="loc_srt_ConsolidatedEntitiesAxis_7552b5c3-131b-482c-bd09-dd2168090ddb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_7552b5c3-131b-482c-bd09-dd2168090ddb_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_7552b5c3-131b-482c-bd09-dd2168090ddb" xlink:to="loc_srt_ConsolidatedEntitiesDomain_7552b5c3-131b-482c-bd09-dd2168090ddb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_bd42fcb6-0493-4b0d-aee7-27c997543ae8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_7552b5c3-131b-482c-bd09-dd2168090ddb" xlink:to="loc_srt_ConsolidatedEntitiesDomain_bd42fcb6-0493-4b0d-aee7-27c997543ae8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_5a615f60-6774-43b6-a6c0-12c95329f893" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_070c4225-9a3f-4948-8a30-56c684151eb4" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_5a615f60-6774-43b6-a6c0-12c95329f893" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_5a615f60-6774-43b6-a6c0-12c95329f893_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_5a615f60-6774-43b6-a6c0-12c95329f893" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_5a615f60-6774-43b6-a6c0-12c95329f893_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_b379d24e-979c-4858-85c6-0915f21b21d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_5a615f60-6774-43b6-a6c0-12c95329f893" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_b379d24e-979c-4858-85c6-0915f21b21d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember_20d128d4-00c4-4730-87da-f6babefeb49f" xlink:href="nnbr-20231231.xsd#nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_b379d24e-979c-4858-85c6-0915f21b21d8" xlink:to="loc_nnbr_WuxiWeifuAutocamPrecisionMachineryCompanyLtdMember_20d128d4-00c4-4730-87da-f6babefeb49f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsAxis_c6ce0b40-0816-43b7-86f1-30e92fe3831f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_070c4225-9a3f-4948-8a30-56c684151eb4" xlink:to="loc_us-gaap_DividendsAxis_c6ce0b40-0816-43b7-86f1-30e92fe3831f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_c6ce0b40-0816-43b7-86f1-30e92fe3831f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DividendsAxis_c6ce0b40-0816-43b7-86f1-30e92fe3831f" xlink:to="loc_us-gaap_DividendsDomain_c6ce0b40-0816-43b7-86f1-30e92fe3831f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_6d9e8fd2-5fac-4c53-ba77-ab622a99fcbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DividendsAxis_c6ce0b40-0816-43b7-86f1-30e92fe3831f" xlink:to="loc_us-gaap_DividendsDomain_6d9e8fd2-5fac-4c53-ba77-ab622a99fcbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendDeclaredMember_9b6c8572-1a2b-472f-a16b-2a818c67ea65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DividendDeclaredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_6d9e8fd2-5fac-4c53-ba77-ab622a99fcbf" xlink:to="loc_us-gaap_DividendDeclaredMember_9b6c8572-1a2b-472f-a16b-2a818c67ea65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_a39c8dcc-44b9-4c51-aa01-009e2a8c9a29" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4df8b24d-1fc8-4cd8-a27e-d25f1573702e" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_a39c8dcc-44b9-4c51-aa01-009e2a8c9a29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a95301cc-c911-49d0-9ffe-133fdf901172" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4df8b24d-1fc8-4cd8-a27e-d25f1573702e" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a95301cc-c911-49d0-9ffe-133fdf901172" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_6adddd69-0189-4121-955a-9e5c2ea8ad6c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsAndOtherReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_4df8b24d-1fc8-4cd8-a27e-d25f1573702e" xlink:to="loc_us-gaap_AccountsAndOtherReceivablesNetCurrent_6adddd69-0189-4121-955a-9e5c2ea8ad6c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/DebtSummaryofDebtDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#DebtSummaryofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/DebtSummaryofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_93030bfd-6444-4138-a154-ee7f66fe2d21" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_0e0b2b6d-11fc-43d8-8674-4a026bb20888" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93030bfd-6444-4138-a154-ee7f66fe2d21" xlink:to="loc_us-gaap_DebtInstrumentTable_0e0b2b6d-11fc-43d8-8674-4a026bb20888" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_ccc3001a-8596-4ac5-957c-d353a4af066b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0e0b2b6d-11fc-43d8-8674-4a026bb20888" xlink:to="loc_us-gaap_DebtInstrumentAxis_ccc3001a-8596-4ac5-957c-d353a4af066b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ccc3001a-8596-4ac5-957c-d353a4af066b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_ccc3001a-8596-4ac5-957c-d353a4af066b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ccc3001a-8596-4ac5-957c-d353a4af066b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_38a9872e-358d-41fd-947f-17fc915d6b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_ccc3001a-8596-4ac5-957c-d353a4af066b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_38a9872e-358d-41fd-947f-17fc915d6b8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TermLoanFacilityMember_96cab8ee-1d4f-4ac7-9960-e69cbed483e3" xlink:href="nnbr-20231231.xsd#nnbr_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_38a9872e-358d-41fd-947f-17fc915d6b8d" xlink:to="loc_nnbr_TermLoanFacilityMember_96cab8ee-1d4f-4ac7-9960-e69cbed483e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_AssetBackedCreditFacilityMember_67ddca8a-628f-4579-8c72-d1013eaf83c3" xlink:href="nnbr-20231231.xsd#nnbr_AssetBackedCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_38a9872e-358d-41fd-947f-17fc915d6b8d" xlink:to="loc_nnbr_AssetBackedCreditFacilityMember_67ddca8a-628f-4579-8c72-d1013eaf83c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_InternationalLoansMember_2e3e77f7-f57a-4708-8a70-c74685c491d2" xlink:href="nnbr-20231231.xsd#nnbr_InternationalLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_38a9872e-358d-41fd-947f-17fc915d6b8d" xlink:to="loc_nnbr_InternationalLoansMember_2e3e77f7-f57a-4708-8a70-c74685c491d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_0ad9c75b-caed-407e-96bc-c020947123d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0e0b2b6d-11fc-43d8-8674-4a026bb20888" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_0ad9c75b-caed-407e-96bc-c020947123d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_0ad9c75b-caed-407e-96bc-c020947123d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0ad9c75b-caed-407e-96bc-c020947123d9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_0ad9c75b-caed-407e-96bc-c020947123d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e2df977d-6a34-4d5a-8970-519864d14e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_0ad9c75b-caed-407e-96bc-c020947123d9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e2df977d-6a34-4d5a-8970-519864d14e1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_7daa6080-afbf-4b9c-b563-85735356f9b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0e0b2b6d-11fc-43d8-8674-4a026bb20888" xlink:to="loc_us-gaap_VariableRateAxis_7daa6080-afbf-4b9c-b563-85735356f9b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_7daa6080-afbf-4b9c-b563-85735356f9b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_7daa6080-afbf-4b9c-b563-85735356f9b0" xlink:to="loc_us-gaap_VariableRateDomain_7daa6080-afbf-4b9c-b563-85735356f9b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_6cb3067e-0b3d-4b97-bb2a-ed88961516d0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_7daa6080-afbf-4b9c-b563-85735356f9b0" xlink:to="loc_us-gaap_VariableRateDomain_6cb3067e-0b3d-4b97-bb2a-ed88961516d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8703356a-3cdd-47c8-b5b4-ba4876447770" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0e0b2b6d-11fc-43d8-8674-4a026bb20888" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8703356a-3cdd-47c8-b5b4-ba4876447770" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8703356a-3cdd-47c8-b5b4-ba4876447770_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8703356a-3cdd-47c8-b5b4-ba4876447770" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_8703356a-3cdd-47c8-b5b4-ba4876447770_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_374b54ca-b353-4eb5-9280-6fbb10d4b28e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentRedemptionPeriodAxis_8703356a-3cdd-47c8-b5b4-ba4876447770" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPeriodDomain_374b54ca-b353-4eb5-9280-6fbb10d4b28e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_3f0ea280-5e29-485c-852f-8d06e8eff2c6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0e0b2b6d-11fc-43d8-8674-4a026bb20888" xlink:to="loc_srt_RangeAxis_3f0ea280-5e29-485c-852f-8d06e8eff2c6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3f0ea280-5e29-485c-852f-8d06e8eff2c6_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3f0ea280-5e29-485c-852f-8d06e8eff2c6" xlink:to="loc_srt_RangeMember_3f0ea280-5e29-485c-852f-8d06e8eff2c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1422c0fa-a569-43b1-ab04-16257d7fc1b3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3f0ea280-5e29-485c-852f-8d06e8eff2c6" xlink:to="loc_srt_RangeMember_1422c0fa-a569-43b1-ab04-16257d7fc1b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_009b82af-01bd-4e36-8983-97550a5860b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93030bfd-6444-4138-a154-ee7f66fe2d21" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_009b82af-01bd-4e36-8983-97550a5860b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_2e11e49a-e262-49ad-a220-ec32178d8a90" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93030bfd-6444-4138-a154-ee7f66fe2d21" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_2e11e49a-e262-49ad-a220-ec32178d8a90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_41a333c0-6607-426a-8992-c519f9baf65c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNoncurrentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93030bfd-6444-4138-a154-ee7f66fe2d21" xlink:to="loc_us-gaap_DeferredFinanceCostsNoncurrentNet_41a333c0-6607-426a-8992-c519f9baf65c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet_821268b2-0183-48a3-9a14-ebb1f9fa2964" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93030bfd-6444-4138-a154-ee7f66fe2d21" xlink:to="loc_us-gaap_DebtIssuanceCostsLineOfCreditArrangementsNet_821268b2-0183-48a3-9a14-ebb1f9fa2964" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/DebtAdditionalInformationDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#DebtAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/DebtAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_9ad76c8b-de97-4f68-9aaa-19f827c6917c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_9ad76c8b-de97-4f68-9aaa-19f827c6917c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_9ad76c8b-de97-4f68-9aaa-19f827c6917c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_9ad76c8b-de97-4f68-9aaa-19f827c6917c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_9ad76c8b-de97-4f68-9aaa-19f827c6917c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6afed8b9-9948-4466-b6ec-e5a4de202d0b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_9ad76c8b-de97-4f68-9aaa-19f827c6917c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6afed8b9-9948-4466-b6ec-e5a4de202d0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_21a64c3c-3084-4910-b4a1-ac3664f8f774" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_6afed8b9-9948-4466-b6ec-e5a4de202d0b" xlink:to="loc_us-gaap_InterestRateSwapMember_21a64c3c-3084-4910-b4a1-ac3664f8f774" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_d00f7058-dc8c-4866-bf71-9d5c343c455d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:to="loc_us-gaap_DebtInstrumentAxis_d00f7058-dc8c-4866-bf71-9d5c343c455d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_d00f7058-dc8c-4866-bf71-9d5c343c455d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_d00f7058-dc8c-4866-bf71-9d5c343c455d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_d00f7058-dc8c-4866-bf71-9d5c343c455d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_294b91a7-0928-400a-938e-ffb0ab6c77fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_d00f7058-dc8c-4866-bf71-9d5c343c455d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_294b91a7-0928-400a-938e-ffb0ab6c77fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignLineOfCreditMember_d00461a9-6907-454f-8712-a2570fef0ecb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignLineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_294b91a7-0928-400a-938e-ffb0ab6c77fe" xlink:to="loc_us-gaap_ForeignLineOfCreditMember_d00461a9-6907-454f-8712-a2570fef0ecb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_94e486fc-58ad-47f8-8c9c-465911bf20cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:to="loc_us-gaap_CreditFacilityAxis_94e486fc-58ad-47f8-8c9c-465911bf20cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_94e486fc-58ad-47f8-8c9c-465911bf20cc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_94e486fc-58ad-47f8-8c9c-465911bf20cc" xlink:to="loc_us-gaap_CreditFacilityDomain_94e486fc-58ad-47f8-8c9c-465911bf20cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_10414391-f831-4703-bc09-e9165327d37a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_94e486fc-58ad-47f8-8c9c-465911bf20cc" xlink:to="loc_us-gaap_CreditFacilityDomain_10414391-f831-4703-bc09-e9165327d37a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TermLoanFacilityMemberMember_25d763c9-5e2d-4629-90ca-cc982643bcd7" xlink:href="nnbr-20231231.xsd#nnbr_TermLoanFacilityMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_10414391-f831-4703-bc09-e9165327d37a" xlink:to="loc_nnbr_TermLoanFacilityMemberMember_25d763c9-5e2d-4629-90ca-cc982643bcd7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_AssetBackedCreditFacilityMemberMember_017e3d39-4713-4ed0-9681-933dbde740f7" xlink:href="nnbr-20231231.xsd#nnbr_AssetBackedCreditFacilityMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_10414391-f831-4703-bc09-e9165327d37a" xlink:to="loc_nnbr_AssetBackedCreditFacilityMemberMember_017e3d39-4713-4ed0-9681-933dbde740f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_6d8d6c38-a386-48be-9644-1c492f57021e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_10414391-f831-4703-bc09-e9165327d37a" xlink:to="loc_us-gaap_LetterOfCreditMember_6d8d6c38-a386-48be-9644-1c492f57021e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BridgeLoanMember_a5f17616-1252-43ef-940f-b26326e41984" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BridgeLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_10414391-f831-4703-bc09-e9165327d37a" xlink:to="loc_us-gaap_BridgeLoanMember_a5f17616-1252-43ef-940f-b26326e41984" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TermLoanFacilityMember_ad4a3552-8f4a-41fc-a257-c20ccc77c51a" xlink:href="nnbr-20231231.xsd#nnbr_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_10414391-f831-4703-bc09-e9165327d37a" xlink:to="loc_nnbr_TermLoanFacilityMember_ad4a3552-8f4a-41fc-a257-c20ccc77c51a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_4dad2267-6eaa-4d37-94a2-56ba36f552f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:to="loc_us-gaap_VariableRateAxis_4dad2267-6eaa-4d37-94a2-56ba36f552f1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_4dad2267-6eaa-4d37-94a2-56ba36f552f1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_4dad2267-6eaa-4d37-94a2-56ba36f552f1" xlink:to="loc_us-gaap_VariableRateDomain_4dad2267-6eaa-4d37-94a2-56ba36f552f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_b1554b99-1cbf-424b-8262-024041099231" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_4dad2267-6eaa-4d37-94a2-56ba36f552f1" xlink:to="loc_us-gaap_VariableRateDomain_b1554b99-1cbf-424b-8262-024041099231" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrimeRateMember_51a3030f-c59c-42e3-9388-a9f47016ee9b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrimeRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_b1554b99-1cbf-424b-8262-024041099231" xlink:to="loc_us-gaap_PrimeRateMember_51a3030f-c59c-42e3-9388-a9f47016ee9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_VariousBenchmarkRatesMemberMember_b1f28935-5026-498f-9d45-6cb669fde1b9" xlink:href="nnbr-20231231.xsd#nnbr_VariousBenchmarkRatesMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_b1554b99-1cbf-424b-8262-024041099231" xlink:to="loc_nnbr_VariousBenchmarkRatesMemberMember_b1f28935-5026-498f-9d45-6cb669fde1b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_FederalFundsOrPrimeRateMemberMember_08f6a21e-9e35-4e51-8a25-ead77a44964d" xlink:href="nnbr-20231231.xsd#nnbr_FederalFundsOrPrimeRateMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_b1554b99-1cbf-424b-8262-024041099231" xlink:to="loc_nnbr_FederalFundsOrPrimeRateMemberMember_08f6a21e-9e35-4e51-8a25-ead77a44964d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_35213b03-bca7-4da9-a2c7-663d02d478fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_b1554b99-1cbf-424b-8262-024041099231" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_35213b03-bca7-4da9-a2c7-663d02d478fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_71374f5a-7516-456e-82ef-72ce06eae988" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:to="loc_srt_RangeAxis_71374f5a-7516-456e-82ef-72ce06eae988" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_71374f5a-7516-456e-82ef-72ce06eae988_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_71374f5a-7516-456e-82ef-72ce06eae988" xlink:to="loc_srt_RangeMember_71374f5a-7516-456e-82ef-72ce06eae988_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1cf06f63-be62-4809-99ed-12e69aa16ecc" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_71374f5a-7516-456e-82ef-72ce06eae988" xlink:to="loc_srt_RangeMember_1cf06f63-be62-4809-99ed-12e69aa16ecc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_34682101-cd27-4337-ba84-eb6ab77336df" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1cf06f63-be62-4809-99ed-12e69aa16ecc" xlink:to="loc_srt_MinimumMember_34682101-cd27-4337-ba84-eb6ab77336df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_eee8e4b9-3dff-4968-bca9-fa7ba9e9b833" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1cf06f63-be62-4809-99ed-12e69aa16ecc" xlink:to="loc_srt_MaximumMember_eee8e4b9-3dff-4968-bca9-fa7ba9e9b833" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_89ea991a-2609-47cb-9651-aff2d1368960" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_89ea991a-2609-47cb-9651-aff2d1368960" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_89ea991a-2609-47cb-9651-aff2d1368960_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_89ea991a-2609-47cb-9651-aff2d1368960" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_89ea991a-2609-47cb-9651-aff2d1368960_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_772bcda0-cbd7-4942-9148-0be01f30d233" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_89ea991a-2609-47cb-9651-aff2d1368960" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_772bcda0-cbd7-4942-9148-0be01f30d233" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_96f19c81-2a4d-459e-b005-36c05ba9745a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_3dbd7d22-d262-4582-a52a-a3704c805ed0" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_96f19c81-2a4d-459e-b005-36c05ba9745a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_96f19c81-2a4d-459e-b005-36c05ba9745a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_96f19c81-2a4d-459e-b005-36c05ba9745a" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_96f19c81-2a4d-459e-b005-36c05ba9745a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_cfb68e81-b426-4638-a4b5-9108743576bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_96f19c81-2a4d-459e-b005-36c05ba9745a" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_cfb68e81-b426-4638-a4b5-9108743576bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_17933271-1056-4925-b6a1-c976b3502955" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_17933271-1056-4925-b6a1-c976b3502955" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c440fb00-cb32-4643-90a3-463f12f40300" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_c440fb00-cb32-4643-90a3-463f12f40300" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_6c764cc0-7ebf-45c5-86d5-886988bb1011" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestCostsCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_InterestCostsCapitalized_6c764cc0-7ebf-45c5-86d5-886988bb1011" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_d8a878a7-52f1-4694-92e6-164be4d9d9cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_d8a878a7-52f1-4694-92e6-164be4d9d9cb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_bb13bf68-88bc-4e19-aec9-9d5b724cb886" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_RepaymentsOfDebt_bb13bf68-88bc-4e19-aec9-9d5b724cb886" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_60b1b7a6-cadc-4912-86aa-8af0b49e3c8d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_60b1b7a6-cadc-4912-86aa-8af0b49e3c8d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1ec332ef-8a69-4841-ad69-e6481a7ec9c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1ec332ef-8a69-4841-ad69-e6481a7ec9c2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_796feb17-0133-4687-9f8e-bec25f666a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_796feb17-0133-4687-9f8e-bec25f666a6a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_8e119691-8847-46bf-93e7-01b0f8dac21c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_8e119691-8847-46bf-93e7-01b0f8dac21c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayable_486964b1-f88d-41c6-b7da-f72a5ccad2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LoansPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_LoansPayable_486964b1-f88d-41c6-b7da-f72a5ccad2cf" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_9f18915f-d13b-4556-b5f0-2fc835237d99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_9f18915f-d13b-4556-b5f0-2fc835237d99" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_5f4fa6f8-1b03-4438-a738-50772e087d24" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_5f4fa6f8-1b03-4438-a738-50772e087d24" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_c1617ad3-ddd1-4590-8714-92f679d031b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_c1617ad3-ddd1-4590-8714-92f679d031b8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_8064d367-d442-475a-aaf2-daf1c2180f2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_8064d367-d442-475a-aaf2-daf1c2180f2b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_db53884f-d28e-4623-a3ec-9891c795658d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_db53884f-d28e-4623-a3ec-9891c795658d" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayable_ec8fd17a-5297-47d1-b109-fb0c450d213b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_NotesPayable_ec8fd17a-5297-47d1-b109-fb0c450d213b" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_cd6d27b4-8c7c-48da-ab9f-f86af9fe4362" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_LongTermDebtCurrent_cd6d27b4-8c7c-48da-ab9f-f86af9fe4362" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_6cb6b5b0-cf48-40ef-8d8a-acee1ed7fb3a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DerivativeNotionalAmount_6cb6b5b0-cf48-40ef-8d8a-acee1ed7fb3a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_b2f0436e-c081-405c-91a7-650541bc0f8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_b2f0436e-c081-405c-91a7-650541bc0f8e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForHedgeInvestingActivities_fe3fd273-c7b8-4713-af8e-3e2ca6baf032" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForHedgeInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_PaymentsForHedgeInvestingActivities_fe3fd273-c7b8-4713-af8e-3e2ca6baf032" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_1b503fe7-21af-4440-bced-a7bb256cd7d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_1b503fe7-21af-4440-bced-a7bb256cd7d3" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_47bae901-ae72-4133-84ac-da60c7085e56" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_47bae901-ae72-4133-84ac-da60c7085e56" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_2978accc-2417-4285-97c7-31b24fe9723b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_2978accc-2417-4285-97c7-31b24fe9723b" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_fef50a6c-ed6e-4208-8288-97c3f09175dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_fef50a6c-ed6e-4208-8288-97c3f09175dc" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ProceedsFromDerivativeInstrumentOperatingActivities_bb74133a-2315-4137-9a84-6e7bdcb2bc94" xlink:href="nnbr-20231231.xsd#nnbr_ProceedsFromDerivativeInstrumentOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_nnbr_ProceedsFromDerivativeInstrumentOperatingActivities_bb74133a-2315-4137-9a84-6e7bdcb2bc94" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_InterestPaidInKindRate_ccd8fa7a-3de8-4129-b6ac-c4afcda42e96" xlink:href="nnbr-20231231.xsd#nnbr_InterestPaidInKindRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_01143b24-371f-449e-a8c5-ee94e3dc73ff" xlink:to="loc_nnbr_InterestPaidInKindRate_ccd8fa7a-3de8-4129-b6ac-c4afcda42e96" xlink:type="arc" order="25"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/PreferredStockAdditionalInformationDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#PreferredStockAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/PreferredStockAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiarySaleOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_0084a712-7771-4e8d-8352-614ef316c92a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_0084a712-7771-4e8d-8352-614ef316c92a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_7df24737-df35-4402-83ad-33bc6cb58f63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_0084a712-7771-4e8d-8352-614ef316c92a" xlink:to="loc_us-gaap_StatementClassOfStockAxis_7df24737-df35-4402-83ad-33bc6cb58f63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_7df24737-df35-4402-83ad-33bc6cb58f63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_7df24737-df35-4402-83ad-33bc6cb58f63" xlink:to="loc_us-gaap_ClassOfStockDomain_7df24737-df35-4402-83ad-33bc6cb58f63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_bee07a4c-0bdf-4a44-95ac-01a203c49056" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_7df24737-df35-4402-83ad-33bc6cb58f63" xlink:to="loc_us-gaap_ClassOfStockDomain_bee07a4c-0bdf-4a44-95ac-01a203c49056" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesDPreferredStockMember_7607fd91-4da3-440d-ab86-61f28fb187d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesDPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_bee07a4c-0bdf-4a44-95ac-01a203c49056" xlink:to="loc_us-gaap_SeriesDPreferredStockMember_7607fd91-4da3-440d-ab86-61f28fb187d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_6a701168-ef02-45e7-a263-d22c64c7b8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_bee07a4c-0bdf-4a44-95ac-01a203c49056" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_6a701168-ef02-45e7-a263-d22c64c7b8a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_9bc97bb8-2332-4d4d-beef-de8810069543" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_0084a712-7771-4e8d-8352-614ef316c92a" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_9bc97bb8-2332-4d4d-beef-de8810069543" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9bc97bb8-2332-4d4d-beef-de8810069543_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_9bc97bb8-2332-4d4d-beef-de8810069543" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_9bc97bb8-2332-4d4d-beef-de8810069543_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_76f3d7d3-6f7b-4fa5-addc-8c3b49ca6a34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_9bc97bb8-2332-4d4d-beef-de8810069543" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_76f3d7d3-6f7b-4fa5-addc-8c3b49ca6a34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_c10a6915-0367-4f50-b8c6-691cd0a7104f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_0084a712-7771-4e8d-8352-614ef316c92a" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_c10a6915-0367-4f50-b8c6-691cd0a7104f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_c10a6915-0367-4f50-b8c6-691cd0a7104f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_c10a6915-0367-4f50-b8c6-691cd0a7104f" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_c10a6915-0367-4f50-b8c6-691cd0a7104f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_a9a9bb79-8262-4d8f-87f6-3723478768c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_c10a6915-0367-4f50-b8c6-691cd0a7104f" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_a9a9bb79-8262-4d8f-87f6-3723478768c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_ee96d219-883b-4fab-9f0d-25820ec05a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_0084a712-7771-4e8d-8352-614ef316c92a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_ee96d219-883b-4fab-9f0d-25820ec05a6e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ee96d219-883b-4fab-9f0d-25820ec05a6e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ee96d219-883b-4fab-9f0d-25820ec05a6e" xlink:to="loc_us-gaap_EquityComponentDomain_ee96d219-883b-4fab-9f0d-25820ec05a6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_682cb355-0d47-4b9d-ad48-71aa60485114" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ee96d219-883b-4fab-9f0d-25820ec05a6e" xlink:to="loc_us-gaap_EquityComponentDomain_682cb355-0d47-4b9d-ad48-71aa60485114" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_f273dec1-3c38-4909-82ba-30899fecc968" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_682cb355-0d47-4b9d-ad48-71aa60485114" xlink:to="loc_us-gaap_CommonStockMember_f273dec1-3c38-4909-82ba-30899fecc968" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_9b78b2d5-551d-4d29-9a7a-e88bc71c32d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_9b78b2d5-551d-4d29-9a7a-e88bc71c32d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_4230ac84-527f-494f-bba1-8307cded0559" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_4230ac84-527f-494f-bba1-8307cded0559" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_7a7bfa7b-d2ba-41c3-98c8-f473fe0dbd53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_7a7bfa7b-d2ba-41c3-98c8-f473fe0dbd53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_eee49e9e-fd53-46b5-b55c-f2630ad9f40d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_eee49e9e-fd53-46b5-b55c-f2630ad9f40d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_e30dab2f-0c05-4fd9-8f26-81ad86b50851" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_e30dab2f-0c05-4fd9-8f26-81ad86b50851" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityLiquidationPreferencePerShare_9d417fd8-f082-464b-b9a4-1e359054a305" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityLiquidationPreferencePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_TemporaryEquityLiquidationPreferencePerShare_9d417fd8-f082-464b-b9a4-1e359054a305" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_2b02aed9-1a53-41b5-9de5-76e8b5e86175" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_2b02aed9-1a53-41b5-9de5-76e8b5e86175" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TemporaryEquityDividendRatePercentage_ad977c2a-c977-42e0-b2d3-136f54765cc9" xlink:href="nnbr-20231231.xsd#nnbr_TemporaryEquityDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_nnbr_TemporaryEquityDividendRatePercentage_ad977c2a-c977-42e0-b2d3-136f54765cc9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_361ad53f-49ab-423f-a7e9-1aac0bd3fbf2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_361ad53f-49ab-423f-a7e9-1aac0bd3fbf2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityDividendsAdjustment_1d803b05-f8bc-4ce4-babb-1ac6359e059f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityDividendsAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_TemporaryEquityDividendsAdjustment_1d803b05-f8bc-4ce4-babb-1ac6359e059f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_c57de846-c0c8-4c46-9461-ce385e7c324c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_c57de846-c0c8-4c46-9461-ce385e7c324c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssuedPricePerShare_8dda52f6-6fae-454f-82d2-fe00bcf9e7c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssuedPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_SharesIssuedPricePerShare_8dda52f6-6fae-454f-82d2-fe00bcf9e7c4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_6492ef43-fba0-4fc5-9d57-f6fc2202a337" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_6492ef43-fba0-4fc5-9d57-f6fc2202a337" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_e0e93f7e-2b8f-467b-9190-4f1a29367952" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_e0e93f7e-2b8f-467b-9190-4f1a29367952" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TemporaryEquityDividendsUnpaidDeemed_4a73a560-73ea-4d11-aefd-fafdd9dfeb7f" xlink:href="nnbr-20231231.xsd#nnbr_TemporaryEquityDividendsUnpaidDeemed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_nnbr_TemporaryEquityDividendsUnpaidDeemed_4a73a560-73ea-4d11-aefd-fafdd9dfeb7f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TemporaryEquityDividendRatePercentageIncreaseIfNoDividendPaid_a10aa9ac-e73e-4e4c-b7e0-893fd8277fab" xlink:href="nnbr-20231231.xsd#nnbr_TemporaryEquityDividendRatePercentageIncreaseIfNoDividendPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_nnbr_TemporaryEquityDividendRatePercentageIncreaseIfNoDividendPaid_a10aa9ac-e73e-4e4c-b7e0-893fd8277fab" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TemporaryEquityDividendRatePercentageAnnualIncrease_fdcc9ddb-11ab-47d8-b0bf-b9cb4cead07e" xlink:href="nnbr-20231231.xsd#nnbr_TemporaryEquityDividendRatePercentageAnnualIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_12d00403-2f16-4fd3-948d-0e60142cad97" xlink:to="loc_nnbr_TemporaryEquityDividendRatePercentageAnnualIncrease_fdcc9ddb-11ab-47d8-b0bf-b9cb4cead07e" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/PreferredStockChangeinPreferredStockCarryingValueDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#PreferredStockChangeinPreferredStockCarryingValueDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/PreferredStockChangeinPreferredStockCarryingValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityLineItems_c9f850ad-e0df-458f-a740-22eab470c6c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityByClassOfStockTable_703ab427-b5a2-40cb-8a4d-5b587798572f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityByClassOfStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_TemporaryEquityLineItems_c9f850ad-e0df-458f-a740-22eab470c6c1" xlink:to="loc_us-gaap_TemporaryEquityByClassOfStockTable_703ab427-b5a2-40cb-8a4d-5b587798572f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_0c64770b-a415-434c-9014-2b9061d35700" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TemporaryEquityByClassOfStockTable_703ab427-b5a2-40cb-8a4d-5b587798572f" xlink:to="loc_us-gaap_StatementClassOfStockAxis_0c64770b-a415-434c-9014-2b9061d35700" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_0c64770b-a415-434c-9014-2b9061d35700_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_0c64770b-a415-434c-9014-2b9061d35700" xlink:to="loc_us-gaap_ClassOfStockDomain_0c64770b-a415-434c-9014-2b9061d35700_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_0b6e026a-938a-4ce0-8ade-4e8f923eb0aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_0c64770b-a415-434c-9014-2b9061d35700" xlink:to="loc_us-gaap_ClassOfStockDomain_0b6e026a-938a-4ce0-8ade-4e8f923eb0aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesDPreferredStockMember_488bd406-7e55-4099-ad7f-fec34e34291d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesDPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_0b6e026a-938a-4ce0-8ade-4e8f923eb0aa" xlink:to="loc_us-gaap_SeriesDPreferredStockMember_488bd406-7e55-4099-ad7f-fec34e34291d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_9598d208-e7e1-421b-ba19-1d24447c95ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_0b6e026a-938a-4ce0-8ade-4e8f923eb0aa" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_9598d208-e7e1-421b-ba19-1d24447c95ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_c9f850ad-e0df-458f-a740-22eab470c6c1" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_eedc940e-ad6b-4510-8316-6c0ed5179350" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_eedc940e-ad6b-4510-8316-6c0ed5179350" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_c736a833-24ab-419c-8255-a60d40329ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:to="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_c736a833-24ab-419c-8255-a60d40329ee3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TemporaryEquityFairValueOfWarrantsIssued_49003001-1685-43d1-a5fd-bb9952486a25" xlink:href="nnbr-20231231.xsd#nnbr_TemporaryEquityFairValueOfWarrantsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:to="loc_nnbr_TemporaryEquityFairValueOfWarrantsIssued_49003001-1685-43d1-a5fd-bb9952486a25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TemporaryEquityRecognitionOfBifurcatedEmbeddedDerivative_41af7e98-847a-4657-bd37-ca03d558c32f" xlink:href="nnbr-20231231.xsd#nnbr_TemporaryEquityRecognitionOfBifurcatedEmbeddedDerivative"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:to="loc_nnbr_TemporaryEquityRecognitionOfBifurcatedEmbeddedDerivative_41af7e98-847a-4657-bd37-ca03d558c32f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityDividendsAdjustment_d20a21df-d4bd-4462-bcf7-51f11f4838fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityDividendsAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:to="loc_us-gaap_TemporaryEquityDividendsAdjustment_d20a21df-d4bd-4462-bcf7-51f11f4838fb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityOtherChanges_15041bce-56e4-4c71-8234-05770e375aed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityOtherChanges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:to="loc_us-gaap_TemporaryEquityOtherChanges_15041bce-56e4-4c71-8234-05770e375aed" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TemporaryEquityRedemption_89716afe-ea90-4d45-b434-77343722d281" xlink:href="nnbr-20231231.xsd#nnbr_TemporaryEquityRedemption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_949c3185-516b-430f-9d50-e8a1e9eec721" xlink:to="loc_nnbr_TemporaryEquityRedemption_89716afe-ea90-4d45-b434-77343722d281" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_64ef8549-3024-4776-80a0-0da785b17074" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/LeasesBalanceSheetDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#LeasesBalanceSheetDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/LeasesBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_83316abd-0966-4713-a4a0-01762d474d96" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_83316abd-0966-4713-a4a0-01762d474d96" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_75f25d2a-172c-47e6-ada7-a3e99895b2ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_83316abd-0966-4713-a4a0-01762d474d96" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_75f25d2a-172c-47e6-ada7-a3e99895b2ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_75f25d2a-172c-47e6-ada7-a3e99895b2ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_75f25d2a-172c-47e6-ada7-a3e99895b2ec" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_75f25d2a-172c-47e6-ada7-a3e99895b2ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_6dca88e4-531f-41d7-b1f6-e60fb1018eef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_75f25d2a-172c-47e6-ada7-a3e99895b2ec" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_6dca88e4-531f-41d7-b1f6-e60fb1018eef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_2850cd32-8d4e-4c16-bc22-4ff8e30d48ae" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_83316abd-0966-4713-a4a0-01762d474d96" xlink:to="loc_srt_CounterpartyNameAxis_2850cd32-8d4e-4c16-bc22-4ff8e30d48ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_2850cd32-8d4e-4c16-bc22-4ff8e30d48ae_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_2850cd32-8d4e-4c16-bc22-4ff8e30d48ae" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_2850cd32-8d4e-4c16-bc22-4ff8e30d48ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_4e13a381-be0a-46d9-9edf-8803dacb4815" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_2850cd32-8d4e-4c16-bc22-4ff8e30d48ae" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_4e13a381-be0a-46d9-9edf-8803dacb4815" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_d576f73a-7ca3-4595-bd03-97366f147cc6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_83316abd-0966-4713-a4a0-01762d474d96" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_d576f73a-7ca3-4595-bd03-97366f147cc6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d576f73a-7ca3-4595-bd03-97366f147cc6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d576f73a-7ca3-4595-bd03-97366f147cc6" xlink:to="loc_us-gaap_SegmentDomain_d576f73a-7ca3-4595-bd03-97366f147cc6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6691dd33-8ede-45b5-b1d2-21af6d3892b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_d576f73a-7ca3-4595-bd03-97366f147cc6" xlink:to="loc_us-gaap_SegmentDomain_6691dd33-8ede-45b5-b1d2-21af6d3892b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionAxis_8735e8fa-6a82-44c5-a8f4-33932c4d5924" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicDistributionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_83316abd-0966-4713-a4a0-01762d474d96" xlink:to="loc_us-gaap_GeographicDistributionAxis_8735e8fa-6a82-44c5-a8f4-33932c4d5924" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_8735e8fa-6a82-44c5-a8f4-33932c4d5924_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GeographicDistributionAxis_8735e8fa-6a82-44c5-a8f4-33932c4d5924" xlink:to="loc_us-gaap_GeographicDistributionDomain_8735e8fa-6a82-44c5-a8f4-33932c4d5924_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicDistributionDomain_a4334ffd-2bf1-4763-ba55-121d83dec927" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeographicDistributionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GeographicDistributionAxis_8735e8fa-6a82-44c5-a8f4-33932c4d5924" xlink:to="loc_us-gaap_GeographicDistributionDomain_a4334ffd-2bf1-4763-ba55-121d83dec927" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_0667cbdb-d06f-45db-8fc6-7df6dd5cecd1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_83316abd-0966-4713-a4a0-01762d474d96" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_0667cbdb-d06f-45db-8fc6-7df6dd5cecd1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0667cbdb-d06f-45db-8fc6-7df6dd5cecd1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_0667cbdb-d06f-45db-8fc6-7df6dd5cecd1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0667cbdb-d06f-45db-8fc6-7df6dd5cecd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4260dcee-6d70-4582-83ed-654ab29d0f27" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_0667cbdb-d06f-45db-8fc6-7df6dd5cecd1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4260dcee-6d70-4582-83ed-654ab29d0f27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_3a2a1187-e9f2-4d98-a1a5-7546c90b9f66" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_83316abd-0966-4713-a4a0-01762d474d96" xlink:to="loc_us-gaap_LeaseContractualTermAxis_3a2a1187-e9f2-4d98-a1a5-7546c90b9f66" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_3a2a1187-e9f2-4d98-a1a5-7546c90b9f66_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_3a2a1187-e9f2-4d98-a1a5-7546c90b9f66" xlink:to="loc_us-gaap_LeaseContractualTermDomain_3a2a1187-e9f2-4d98-a1a5-7546c90b9f66_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_95ca267d-fd82-4712-a125-c368cbc8688c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_3a2a1187-e9f2-4d98-a1a5-7546c90b9f66" xlink:to="loc_us-gaap_LeaseContractualTermDomain_95ca267d-fd82-4712-a125-c368cbc8688c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_55b83c9e-a087-4aae-9dff-d76e86f03b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_55b83c9e-a087-4aae-9dff-d76e86f03b6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_c33529ed-e893-470b-a567-366cc9011a27" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_c33529ed-e893-470b-a567-366cc9011a27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_LeaseRightOfUseAsset_e76fbb6a-13f2-4ec0-baf7-53fbcd769f96" xlink:href="nnbr-20231231.xsd#nnbr_LeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_nnbr_LeaseRightOfUseAsset_e76fbb6a-13f2-4ec0-baf7-53fbcd769f96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_b29624f2-f5d1-4eda-83ff-43046b1e83fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_b29624f2-f5d1-4eda-83ff-43046b1e83fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_62d24a0d-a5d5-4b3b-92f1-6f8c54dcb673" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_62d24a0d-a5d5-4b3b-92f1-6f8c54dcb673" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_61f9ec93-0b09-46c0-abc5-b3fa35afc27c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_61f9ec93-0b09-46c0-abc5-b3fa35afc27c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_6752b089-bd2f-412e-85e2-66038e2c3cb4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_6752b089-bd2f-412e-85e2-66038e2c3cb4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_d6c7af94-fada-49df-b959-adf8fc8ca242" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_d6c7af94-fada-49df-b959-adf8fc8ca242" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_a2a3a350-d7af-4bd8-94e0-0fbc9b765016" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_a2a3a350-d7af-4bd8-94e0-0fbc9b765016" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_LeaseLiability_13d26cbf-9d60-42c4-a436-9bea95256ad8" xlink:href="nnbr-20231231.xsd#nnbr_LeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_nnbr_LeaseLiability_13d26cbf-9d60-42c4-a436-9bea95256ad8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_7b56192b-759e-419b-90b4-e58d6b6fdc37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_8654f39c-25a1-457c-ab89-7ea4d8b5f34b" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_7b56192b-759e-419b-90b4-e58d6b6fdc37" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/SubleasesFutureCashFlowsDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#SubleasesFutureCashFlowsDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/SubleasesFutureCashFlowsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionLineItems_26a6a368-3b45-4d04-807e-34144a56409a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionTable_35f037b2-34c8-4b91-9aa3-f076cf89458f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_26a6a368-3b45-4d04-807e-34144a56409a" xlink:to="loc_us-gaap_LessorLeaseDescriptionTable_35f037b2-34c8-4b91-9aa3-f076cf89458f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesAxis_466b67a7-212c-4f48-bc36-6e6025c0601f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RealEstatePropertiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LessorLeaseDescriptionTable_35f037b2-34c8-4b91-9aa3-f076cf89458f" xlink:to="loc_us-gaap_RealEstatePropertiesAxis_466b67a7-212c-4f48-bc36-6e6025c0601f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesDomain_466b67a7-212c-4f48-bc36-6e6025c0601f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RealEstatePropertiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RealEstatePropertiesAxis_466b67a7-212c-4f48-bc36-6e6025c0601f" xlink:to="loc_us-gaap_RealEstatePropertiesDomain_466b67a7-212c-4f48-bc36-6e6025c0601f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealEstatePropertiesDomain_11e5d9fd-8ebe-46c6-95a2-5b3808b7305e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RealEstatePropertiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RealEstatePropertiesAxis_466b67a7-212c-4f48-bc36-6e6025c0601f" xlink:to="loc_us-gaap_RealEstatePropertiesDomain_11e5d9fd-8ebe-46c6-95a2-5b3808b7305e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOperatingLeaseMember_db7caf91-a55b-48a9-833c-41fbdb3aacaf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertySubjectToOperatingLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RealEstatePropertiesDomain_11e5d9fd-8ebe-46c6-95a2-5b3808b7305e" xlink:to="loc_us-gaap_PropertySubjectToOperatingLeaseMember_db7caf91-a55b-48a9-833c-41fbdb3aacaf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_b7d4c6b6-4927-4242-aa5d-2fcecf763804" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_26a6a368-3b45-4d04-807e-34144a56409a" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths_b7d4c6b6-4927-4242-aa5d-2fcecf763804" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_beb39e5e-56b9-40d5-99f0-02572f43122d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_26a6a368-3b45-4d04-807e-34144a56409a" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedTwoYears_beb39e5e-56b9-40d5-99f0-02572f43122d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_da9b0bfe-211e-462e-a5e2-4fc867f7cbd5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_26a6a368-3b45-4d04-807e-34144a56409a" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThreeYears_da9b0bfe-211e-462e-a5e2-4fc867f7cbd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_4ecc417d-df70-41d1-b0da-60bb0bd17fbd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_26a6a368-3b45-4d04-807e-34144a56409a" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFourYears_4ecc417d-df70-41d1-b0da-60bb0bd17fbd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_63155f77-e7dd-4a68-af47-604b7ba4e379" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_26a6a368-3b45-4d04-807e-34144a56409a" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedFiveYears_63155f77-e7dd-4a68-af47-604b7ba4e379" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_89358d8f-f08f-4635-ac6e-6e9ccaeb2567" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_26a6a368-3b45-4d04-807e-34144a56409a" xlink:to="loc_us-gaap_LessorOperatingLeasePaymentsToBeReceivedThereafter_89358d8f-f08f-4635-ac6e-6e9ccaeb2567" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/CommitmentsandContingenciesAdditionalInformationDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#CommitmentsandContingenciesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/CommitmentsandContingenciesAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ContingenciesAndCommitmentsLineItems_51b601a5-bf61-41d7-af08-1bb599c884ad" xlink:href="nnbr-20231231.xsd#nnbr_ContingenciesAndCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ContingenciesAndCommitmentsTable_3ddae216-7ef1-46af-a204-65c49976acd0" xlink:href="nnbr-20231231.xsd#nnbr_ContingenciesAndCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_nnbr_ContingenciesAndCommitmentsLineItems_51b601a5-bf61-41d7-af08-1bb599c884ad" xlink:to="loc_nnbr_ContingenciesAndCommitmentsTable_3ddae216-7ef1-46af-a204-65c49976acd0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_aaaa940d-82e3-4118-92e5-7ffd58e08865" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nnbr_ContingenciesAndCommitmentsTable_3ddae216-7ef1-46af-a204-65c49976acd0" xlink:to="loc_srt_RangeAxis_aaaa940d-82e3-4118-92e5-7ffd58e08865" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aaaa940d-82e3-4118-92e5-7ffd58e08865_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_aaaa940d-82e3-4118-92e5-7ffd58e08865" xlink:to="loc_srt_RangeMember_aaaa940d-82e3-4118-92e5-7ffd58e08865_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ca4035a6-636d-4045-8f39-3c19f7e1ddcb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_aaaa940d-82e3-4118-92e5-7ffd58e08865" xlink:to="loc_srt_RangeMember_ca4035a6-636d-4045-8f39-3c19f7e1ddcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f0bb330e-4868-4db8-bb43-03e3775f66af" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ca4035a6-636d-4045-8f39-3c19f7e1ddcb" xlink:to="loc_srt_MaximumMember_f0bb330e-4868-4db8-bb43-03e3775f66af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_fe4f49c5-5007-496e-af4c-6eb075fb22b8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nnbr_ContingenciesAndCommitmentsTable_3ddae216-7ef1-46af-a204-65c49976acd0" xlink:to="loc_srt_LitigationCaseAxis_fe4f49c5-5007-496e-af4c-6eb075fb22b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_fe4f49c5-5007-496e-af4c-6eb075fb22b8_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_fe4f49c5-5007-496e-af4c-6eb075fb22b8" xlink:to="loc_srt_LitigationCaseTypeDomain_fe4f49c5-5007-496e-af4c-6eb075fb22b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_b92dbf1f-93bc-40c2-941d-759599f0e49d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_fe4f49c5-5007-496e-af4c-6eb075fb22b8" xlink:to="loc_srt_LitigationCaseTypeDomain_b92dbf1f-93bc-40c2-941d-759599f0e49d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_b1d1be95-296c-4145-9fd4-d27c7a472497" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_ContingenciesAndCommitmentsLineItems_51b601a5-bf61-41d7-af08-1bb599c884ad" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_b1d1be95-296c-4145-9fd4-d27c7a472497" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_6c1b4448-534e-4368-a5e3-5da9d0621578" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_ContingenciesAndCommitmentsLineItems_51b601a5-bf61-41d7-af08-1bb599c884ad" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_6c1b4448-534e-4368-a5e3-5da9d0621578" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_d36752aa-095a-4dd1-bbd1-ef873c866698" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_ContingenciesAndCommitmentsLineItems_51b601a5-bf61-41d7-af08-1bb599c884ad" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_d36752aa-095a-4dd1-bbd1-ef873c866698" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementExpense_3f956fd0-4a1a-461d-bcec-daacc5341d87" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LitigationSettlementExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_ContingenciesAndCommitmentsLineItems_51b601a5-bf61-41d7-af08-1bb599c884ad" xlink:to="loc_us-gaap_LitigationSettlementExpense_3f956fd0-4a1a-461d-bcec-daacc5341d87" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/IncomeTaxesAdditionalInformationDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#IncomeTaxesAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/IncomeTaxesAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:href="nnbr-20231231.xsd#nnbr_IncomeTaxesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_IncomeTaxesTable_55f57790-0add-4004-b9b0-0341f71a8f4a" xlink:href="nnbr-20231231.xsd#nnbr_IncomeTaxesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_nnbr_IncomeTaxesTable_55f57790-0add-4004-b9b0-0341f71a8f4a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_64ba479a-c02e-48fe-961a-a5bb5ea67b53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nnbr_IncomeTaxesTable_55f57790-0add-4004-b9b0-0341f71a8f4a" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_64ba479a-c02e-48fe-961a-a5bb5ea67b53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_64ba479a-c02e-48fe-961a-a5bb5ea67b53_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_64ba479a-c02e-48fe-961a-a5bb5ea67b53" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_64ba479a-c02e-48fe-961a-a5bb5ea67b53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_37da3a46-a406-4d30-b013-51471ac2d75a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_64ba479a-c02e-48fe-961a-a5bb5ea67b53" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_37da3a46-a406-4d30-b013-51471ac2d75a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_68ae8501-e898-4791-8c78-5cefc6658c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_37da3a46-a406-4d30-b013-51471ac2d75a" xlink:to="loc_us-gaap_DomesticCountryMember_68ae8501-e898-4791-8c78-5cefc6658c5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_0dbdd4f4-26d8-4fe3-94e0-32df75fa8f44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_37da3a46-a406-4d30-b013-51471ac2d75a" xlink:to="loc_us-gaap_ForeignCountryMember_0dbdd4f4-26d8-4fe3-94e0-32df75fa8f44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_21736cee-4286-41fa-869b-cd0a1b3a46e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_37da3a46-a406-4d30-b013-51471ac2d75a" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_21736cee-4286-41fa-869b-cd0a1b3a46e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_9043843a-a3fe-4aed-ad99-ce23073d0183" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_9043843a-a3fe-4aed-ad99-ce23073d0183" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_1516db2c-03d0-4c70-8db8-172c40e30418" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_1516db2c-03d0-4c70-8db8-172c40e30418" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_532e4270-7def-411e-86b6-4cee75db2567" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_OperatingLossCarryforwards_532e4270-7def-411e-86b6-4cee75db2567" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsValuationAllowance_55ab4711-9903-4910-97e4-0c957ef1bb44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLossCarryforwardsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_OperatingLossCarryforwardsValuationAllowance_55ab4711-9903-4910-97e4-0c957ef1bb44" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_40331234-a2e2-4626-8d73-f54766b84003" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_40331234-a2e2-4626-8d73-f54766b84003" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOtherTaxCarryforwards_45cbd1a6-ed7c-49fb-bc2c-215ea770bac7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsOtherTaxCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_DeferredTaxAssetsOtherTaxCarryforwards_45cbd1a6-ed7c-49fb-bc2c-215ea770bac7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_cf39ad6e-beac-4b2e-961e-ddcf8f87ba2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_cf39ad6e-beac-4b2e-961e-ddcf8f87ba2b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_fa533581-2e38-4642-b5b7-9b3f97ba6db7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_fa533581-2e38-4642-b5b7-9b3f97ba6db7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries_29337c05-8cca-4dbb-bfff-764428f1b820" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries_29337c05-8cca-4dbb-bfff-764428f1b820" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued_7b297860-e76c-4815-8023-d26ef80bee72" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued_7b297860-e76c-4815-8023-d26ef80bee72" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_d47085a8-33d4-48bf-b45e-a5e122243694" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_d47085a8-33d4-48bf-b45e-a5e122243694" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxHolidayAggregateDollarAmount_951842a1-7f00-4237-8c84-d1fc9e2716ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxHolidayAggregateDollarAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_IncomeTaxHolidayAggregateDollarAmount_951842a1-7f00-4237-8c84-d1fc9e2716ed" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardValuationAllowance_9665c6bf-f665-4ede-b31a-896e915fb11a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_TaxCreditCarryforwardValuationAllowance_9665c6bf-f665-4ede-b31a-896e915fb11a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetIntraEntityTransferAssetOtherThanInventory_543f5cee-e4bc-427a-bb73-48a825b15bf5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredTaxAssetIntraEntityTransferAssetOtherThanInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_DeferredTaxAssetIntraEntityTransferAssetOtherThanInventory_543f5cee-e4bc-427a-bb73-48a825b15bf5" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TaxBenefitPermanentReinvestmentChange_d39fc340-3314-4937-b9ef-a1f0af722399" xlink:href="nnbr-20231231.xsd#nnbr_TaxBenefitPermanentReinvestmentChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_nnbr_TaxBenefitPermanentReinvestmentChange_d39fc340-3314-4937-b9ef-a1f0af722399" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_IncomeTaxRefundInterestIncome_bcbdc68c-7753-4106-9403-3f0640fb377a" xlink:href="nnbr-20231231.xsd#nnbr_IncomeTaxRefundInterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_nnbr_IncomeTaxRefundInterestIncome_bcbdc68c-7753-4106-9403-3f0640fb377a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReceivable_e6429cd9-f518-4053-bb6d-b2f6d3d30f3c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_IncomeTaxesLineItems_4774b2f1-2a73-44c0-94ed-b82f74fc025a" xlink:to="loc_us-gaap_IncomeTaxReceivable_e6429cd9-f518-4053-bb6d-b2f6d3d30f3c" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/NetIncomeLossPerShareNetIncomeLossPerShareNumberofpotentiallydilutiveshareDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#NetIncomeLossPerShareNetIncomeLossPerShareNumberofpotentiallydilutiveshareDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/NetIncomeLossPerShareNetIncomeLossPerShareNumberofpotentiallydilutiveshareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_64461e7b-116e-4f7e-9e06-1681f714e4bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_e59fe224-ea82-4a90-b01a-8046743726f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_64461e7b-116e-4f7e-9e06-1681f714e4bb" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_e59fe224-ea82-4a90-b01a-8046743726f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1238e5c9-1543-40fd-b1f7-88794cf0ff5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_e59fe224-ea82-4a90-b01a-8046743726f8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1238e5c9-1543-40fd-b1f7-88794cf0ff5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1238e5c9-1543-40fd-b1f7-88794cf0ff5e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1238e5c9-1543-40fd-b1f7-88794cf0ff5e" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_1238e5c9-1543-40fd-b1f7-88794cf0ff5e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b21447fb-80f4-4805-bf06-61a4a5ea7075" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_1238e5c9-1543-40fd-b1f7-88794cf0ff5e" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b21447fb-80f4-4805-bf06-61a4a5ea7075" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_e72f756c-407c-4973-b1ae-9cef3b48b95a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b21447fb-80f4-4805-bf06-61a4a5ea7075" xlink:to="loc_us-gaap_EmployeeStockOptionMember_e72f756c-407c-4973-b1ae-9cef3b48b95a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_b31ba744-d63c-4b93-99db-abb60923eb09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_b21447fb-80f4-4805-bf06-61a4a5ea7075" xlink:to="loc_us-gaap_WarrantMember_b31ba744-d63c-4b93-99db-abb60923eb09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_7fd9b3bd-6273-4ed0-a520-0430a8be1a84" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_64461e7b-116e-4f7e-9e06-1681f714e4bb" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_7fd9b3bd-6273-4ed0-a520-0430a8be1a84" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/NetIncomeLossPerShareAdditionalInformationDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#NetIncomeLossPerShareAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/NetIncomeLossPerShareAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_NetIncomePerShareLineItems_504f623e-2a62-42fe-985a-0b6cf71d7dde" xlink:href="nnbr-20231231.xsd#nnbr_NetIncomePerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_NetIncomePerShareTable_c6f6e6ed-7018-4f1d-a124-239fc9a78d7c" xlink:href="nnbr-20231231.xsd#nnbr_NetIncomePerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_nnbr_NetIncomePerShareLineItems_504f623e-2a62-42fe-985a-0b6cf71d7dde" xlink:to="loc_nnbr_NetIncomePerShareTable_c6f6e6ed-7018-4f1d-a124-239fc9a78d7c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_669e8597-21f0-4cc4-89b2-1b4d3e7686b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nnbr_NetIncomePerShareTable_c6f6e6ed-7018-4f1d-a124-239fc9a78d7c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_669e8597-21f0-4cc4-89b2-1b4d3e7686b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_669e8597-21f0-4cc4-89b2-1b4d3e7686b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_669e8597-21f0-4cc4-89b2-1b4d3e7686b7" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_669e8597-21f0-4cc4-89b2-1b4d3e7686b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_9090f268-ee12-4307-8857-30e901fb4e1c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_669e8597-21f0-4cc4-89b2-1b4d3e7686b7" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_9090f268-ee12-4307-8857-30e901fb4e1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_a959a7a2-3013-46d9-959c-cccb2054325e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_9090f268-ee12-4307-8857-30e901fb4e1c" xlink:to="loc_us-gaap_EmployeeStockOptionMember_a959a7a2-3013-46d9-959c-cccb2054325e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_53f1359d-61dd-47e7-b52a-b801429433cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_nnbr_NetIncomePerShareTable_c6f6e6ed-7018-4f1d-a124-239fc9a78d7c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_53f1359d-61dd-47e7-b52a-b801429433cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_53f1359d-61dd-47e7-b52a-b801429433cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_53f1359d-61dd-47e7-b52a-b801429433cd" xlink:to="loc_us-gaap_ClassOfStockDomain_53f1359d-61dd-47e7-b52a-b801429433cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_aa2348ab-e79e-47c2-8630-eb8ef72e0790" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_53f1359d-61dd-47e7-b52a-b801429433cd" xlink:to="loc_us-gaap_ClassOfStockDomain_aa2348ab-e79e-47c2-8630-eb8ef72e0790" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_67629342-4ef5-4b8e-aa7d-3e05b23352c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_aa2348ab-e79e-47c2-8630-eb8ef72e0790" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_67629342-4ef5-4b8e-aa7d-3e05b23352c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange_3fd23d4c-98cf-4481-949b-8a20e80b37bd" xlink:href="nnbr-20231231.xsd#nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_NetIncomePerShareLineItems_504f623e-2a62-42fe-985a-0b6cf71d7dde" xlink:to="loc_nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMinimumPriceRange_3fd23d4c-98cf-4481-949b-8a20e80b37bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne_cbb86405-5b9d-45b0-b10e-a36a9671ff2c" xlink:href="nnbr-20231231.xsd#nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_NetIncomePerShareLineItems_504f623e-2a62-42fe-985a-0b6cf71d7dde" xlink:to="loc_nnbr_AntiDilutiveSecuritiesExcludedFromComputationOfEarningsPerShareMaximumPriceRangeOne_cbb86405-5b9d-45b0-b10e-a36a9671ff2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_6227aa06-369a-41e9-be39-74c3e0c1ced9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_NetIncomePerShareLineItems_504f623e-2a62-42fe-985a-0b6cf71d7dde" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_6227aa06-369a-41e9-be39-74c3e0c1ced9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights_7a9e75af-354f-4bc2-9c5b-31a1b40c8efc" xlink:href="nnbr-20231231.xsd#nnbr_ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_nnbr_NetIncomePerShareLineItems_504f623e-2a62-42fe-985a-0b6cf71d7dde" xlink:to="loc_nnbr_ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights_7a9e75af-354f-4bc2-9c5b-31a1b40c8efc" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/ShareBasedCompensationComponentsofShareBasedCompensationExpensebyTypeofAwardDetail" xlink:type="simple" xlink:href="nnbr-20231231.xsd#ShareBasedCompensationComponentsofShareBasedCompensationExpensebyTypeofAwardDetail"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/ShareBasedCompensationComponentsofShareBasedCompensationExpensebyTypeofAwardDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_072f300f-ff64-43d1-86ca-6bdb9d2c2a1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f57bf087-8820-4ba3-b286-a2d438cdfe34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_072f300f-ff64-43d1-86ca-6bdb9d2c2a1d" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f57bf087-8820-4ba3-b286-a2d438cdfe34" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c43e8812-0751-4a46-8393-c464882e5f9a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_f57bf087-8820-4ba3-b286-a2d438cdfe34" xlink:to="loc_us-gaap_AwardTypeAxis_c43e8812-0751-4a46-8393-c464882e5f9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c43e8812-0751-4a46-8393-c464882e5f9a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c43e8812-0751-4a46-8393-c464882e5f9a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c43e8812-0751-4a46-8393-c464882e5f9a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_69d3092a-792c-4cbc-bb7c-0c9dc875ed6f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c43e8812-0751-4a46-8393-c464882e5f9a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_69d3092a-792c-4cbc-bb7c-0c9dc875ed6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_11dbae9c-b8d8-4a4b-ab46-39560fb9c457" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_69d3092a-792c-4cbc-bb7c-0c9dc875ed6f" xlink:to="loc_us-gaap_RestrictedStockMember_11dbae9c-b8d8-4a4b-ab46-39560fb9c457" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_b2fb3993-c9cb-4fe6-a92c-79c4c4878ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_69d3092a-792c-4cbc-bb7c-0c9dc875ed6f" xlink:to="loc_us-gaap_PerformanceSharesMember_b2fb3993-c9cb-4fe6-a92c-79c4c4878ce8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_2c24229a-d192-4227-9ae8-ef0d2687801d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_69d3092a-792c-4cbc-bb7c-0c9dc875ed6f" xlink:to="loc_us-gaap_EmployeeStockOptionMember_2c24229a-d192-4227-9ae8-ef0d2687801d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_d1aa015d-091c-4c81-8e1a-5a6c7cad0e57" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_072f300f-ff64-43d1-86ca-6bdb9d2c2a1d" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_d1aa015d-091c-4c81-8e1a-5a6c7cad0e57" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/ShareBasedCompensationRestrictedAwardsRollforwardDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#ShareBasedCompensationRestrictedAwardsRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/ShareBasedCompensationRestrictedAwardsRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_35e15024-270d-437c-9b65-16de0533b742" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_35e15024-270d-437c-9b65-16de0533b742" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e629448a-d910-4916-a641-f4ee3c23b106" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:to="loc_us-gaap_AwardTypeAxis_e629448a-d910-4916-a641-f4ee3c23b106" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e629448a-d910-4916-a641-f4ee3c23b106_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e629448a-d910-4916-a641-f4ee3c23b106" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e629448a-d910-4916-a641-f4ee3c23b106_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_23366c13-66ac-49f3-a827-8a208b739092" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e629448a-d910-4916-a641-f4ee3c23b106" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_23366c13-66ac-49f3-a827-8a208b739092" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_c5e42fc0-2b4b-4123-ad1b-10c8ea68a3a6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_23366c13-66ac-49f3-a827-8a208b739092" xlink:to="loc_us-gaap_RestrictedStockMember_c5e42fc0-2b4b-4123-ad1b-10c8ea68a3a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_9b05af8b-d695-47ba-83bc-8b0b9f892a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_23366c13-66ac-49f3-a827-8a208b739092" xlink:to="loc_us-gaap_PerformanceSharesMember_9b05af8b-d695-47ba-83bc-8b0b9f892a1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateAxis_ca89e08d-d260-42d7-bc05-2669831aed37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:to="loc_us-gaap_AwardDateAxis_ca89e08d-d260-42d7-bc05-2669831aed37" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_ca89e08d-d260-42d7-bc05-2669831aed37_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardDateAxis_ca89e08d-d260-42d7-bc05-2669831aed37" xlink:to="loc_us-gaap_AwardDateDomain_ca89e08d-d260-42d7-bc05-2669831aed37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_9845dcf2-bc44-4697-ab7b-e73e8654227c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardDateAxis_ca89e08d-d260-42d7-bc05-2669831aed37" xlink:to="loc_us-gaap_AwardDateDomain_9845dcf2-bc44-4697-ab7b-e73e8654227c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_ea6afb84-c9bb-4c84-8ca7-8ff551bcf91f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:to="loc_us-gaap_GranteeStatusAxis_ea6afb84-c9bb-4c84-8ca7-8ff551bcf91f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_ea6afb84-c9bb-4c84-8ca7-8ff551bcf91f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_ea6afb84-c9bb-4c84-8ca7-8ff551bcf91f" xlink:to="loc_us-gaap_GranteeStatusDomain_ea6afb84-c9bb-4c84-8ca7-8ff551bcf91f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_33be49eb-c813-467c-ac71-270cdd9e562e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_ea6afb84-c9bb-4c84-8ca7-8ff551bcf91f" xlink:to="loc_us-gaap_GranteeStatusDomain_33be49eb-c813-467c-ac71-270cdd9e562e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_e6469dc1-3fda-4022-ba93-11774d7b8341" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:to="loc_us-gaap_PlanNameAxis_e6469dc1-3fda-4022-ba93-11774d7b8341" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e6469dc1-3fda-4022-ba93-11774d7b8341_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_e6469dc1-3fda-4022-ba93-11774d7b8341" xlink:to="loc_us-gaap_PlanNameDomain_e6469dc1-3fda-4022-ba93-11774d7b8341_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_8b11c020-3d92-4cae-8544-b77d35cf1233" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_e6469dc1-3fda-4022-ba93-11774d7b8341" xlink:to="loc_us-gaap_PlanNameDomain_8b11c020-3d92-4cae-8544-b77d35cf1233" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_f6859390-ce9e-4cbb-9e2c-62c16aa4822e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:to="loc_us-gaap_VestingAxis_f6859390-ce9e-4cbb-9e2c-62c16aa4822e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_f6859390-ce9e-4cbb-9e2c-62c16aa4822e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_f6859390-ce9e-4cbb-9e2c-62c16aa4822e" xlink:to="loc_us-gaap_VestingDomain_f6859390-ce9e-4cbb-9e2c-62c16aa4822e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_1e5c2ff8-af4e-41ee-8eb4-29556b8b0d26" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_f6859390-ce9e-4cbb-9e2c-62c16aa4822e" xlink:to="loc_us-gaap_VestingDomain_1e5c2ff8-af4e-41ee-8eb4-29556b8b0d26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_9d7fa5d2-e320-4872-9fa4-9a1957ae4a43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:to="loc_us-gaap_StatementClassOfStockAxis_9d7fa5d2-e320-4872-9fa4-9a1957ae4a43" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_9d7fa5d2-e320-4872-9fa4-9a1957ae4a43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_9d7fa5d2-e320-4872-9fa4-9a1957ae4a43" xlink:to="loc_us-gaap_ClassOfStockDomain_9d7fa5d2-e320-4872-9fa4-9a1957ae4a43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_ea26f90a-fc89-4cc8-b236-ca572a2611df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_9d7fa5d2-e320-4872-9fa4-9a1957ae4a43" xlink:to="loc_us-gaap_ClassOfStockDomain_ea26f90a-fc89-4cc8-b236-ca572a2611df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_830999e5-45e1-4d23-811a-a552d897a040" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0eb4ae85-2bff-40f3-9958-06d50dfa38c4" xlink:to="loc_srt_RangeAxis_830999e5-45e1-4d23-811a-a552d897a040" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_830999e5-45e1-4d23-811a-a552d897a040_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_830999e5-45e1-4d23-811a-a552d897a040" xlink:to="loc_srt_RangeMember_830999e5-45e1-4d23-811a-a552d897a040_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e776cab1-2f08-491c-9e96-d8fa0b3ed4b3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_830999e5-45e1-4d23-811a-a552d897a040" xlink:to="loc_srt_RangeMember_e776cab1-2f08-491c-9e96-d8fa0b3ed4b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_35e15024-270d-437c-9b65-16de0533b742" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_6e42ff4c-a2e7-43e8-842c-c88a42f4c682" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_6e42ff4c-a2e7-43e8-842c-c88a42f4c682" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_fde52977-8376-4a4a-b2ea-500d90568393" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_fde52977-8376-4a4a-b2ea-500d90568393" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_ef443af9-1183-4853-9b1f-6c93002c121c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_ef443af9-1183-4853-9b1f-6c93002c121c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_5af415e6-109c-49ec-858d-d33122eac777" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_5af415e6-109c-49ec-858d-d33122eac777" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod_c16d3754-9375-4073-8dd2-7a70b5b7571f" xlink:href="nnbr-20231231.xsd#nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod_c16d3754-9375-4073-8dd2-7a70b5b7571f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_371b1437-b932-4f73-aa89-0abc35779019" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_490c5415-d389-49ae-a21a-530e42819e6d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_490c5415-d389-49ae-a21a-530e42819e6d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_67c72a91-f68b-41cd-8ba9-b0dc836e04b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_67c72a91-f68b-41cd-8ba9-b0dc836e04b8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6ca981dc-a57f-4291-bf34-07e0f1f6ece8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6ca981dc-a57f-4291-bf34-07e0f1f6ece8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_dde8aa51-a9e8-40db-bfd7-430ec89fdd94" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_dde8aa51-a9e8-40db-bfd7-430ec89fdd94" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredWeightedAverageGrantDateFairValue_e74c4436-c5c5-4f3f-a41a-ade0bd1ae8fb" xlink:href="nnbr-20231231.xsd#nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_4d767f88-f0ce-4e93-8b88-b920129b8178" xlink:to="loc_nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredWeightedAverageGrantDateFairValue_e74c4436-c5c5-4f3f-a41a-ade0bd1ae8fb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_90d8644e-0e9c-45f6-83d8-74d088ad8118" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/ShareBasedCompensationStockOptionsRollforwardDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#ShareBasedCompensationStockOptionsRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/ShareBasedCompensationStockOptionsRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f4997cec-913a-48ce-9d32-4bce90dc6c96" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f4997cec-913a-48ce-9d32-4bce90dc6c96" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c9fdd5e5-52fa-4b64-bef2-a6e82412ca3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:to="loc_us-gaap_AwardTypeAxis_c9fdd5e5-52fa-4b64-bef2-a6e82412ca3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c9fdd5e5-52fa-4b64-bef2-a6e82412ca3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c9fdd5e5-52fa-4b64-bef2-a6e82412ca3d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c9fdd5e5-52fa-4b64-bef2-a6e82412ca3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0fbaf549-a7a4-4696-81ce-af2ed89374e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c9fdd5e5-52fa-4b64-bef2-a6e82412ca3d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0fbaf549-a7a4-4696-81ce-af2ed89374e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateAxis_7d968c14-0d5b-4207-b0ed-886fda10dd5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:to="loc_us-gaap_AwardDateAxis_7d968c14-0d5b-4207-b0ed-886fda10dd5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_7d968c14-0d5b-4207-b0ed-886fda10dd5e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardDateAxis_7d968c14-0d5b-4207-b0ed-886fda10dd5e" xlink:to="loc_us-gaap_AwardDateDomain_7d968c14-0d5b-4207-b0ed-886fda10dd5e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_32a760d6-8468-4cd2-b961-b329c94d687d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardDateAxis_7d968c14-0d5b-4207-b0ed-886fda10dd5e" xlink:to="loc_us-gaap_AwardDateDomain_32a760d6-8468-4cd2-b961-b329c94d687d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_0419d92b-8a3a-4ad1-95a6-fea6a766f2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:to="loc_us-gaap_GranteeStatusAxis_0419d92b-8a3a-4ad1-95a6-fea6a766f2bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_0419d92b-8a3a-4ad1-95a6-fea6a766f2bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_0419d92b-8a3a-4ad1-95a6-fea6a766f2bc" xlink:to="loc_us-gaap_GranteeStatusDomain_0419d92b-8a3a-4ad1-95a6-fea6a766f2bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_1b90e0a0-3529-4b50-b287-38f6fe064ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_0419d92b-8a3a-4ad1-95a6-fea6a766f2bc" xlink:to="loc_us-gaap_GranteeStatusDomain_1b90e0a0-3529-4b50-b287-38f6fe064ec7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_88eaa2b5-320b-4af8-a7c7-66fb9cdde6e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:to="loc_us-gaap_PlanNameAxis_88eaa2b5-320b-4af8-a7c7-66fb9cdde6e2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_88eaa2b5-320b-4af8-a7c7-66fb9cdde6e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_88eaa2b5-320b-4af8-a7c7-66fb9cdde6e2" xlink:to="loc_us-gaap_PlanNameDomain_88eaa2b5-320b-4af8-a7c7-66fb9cdde6e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b5996491-2e02-40fe-b73f-a091f367b7ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_88eaa2b5-320b-4af8-a7c7-66fb9cdde6e2" xlink:to="loc_us-gaap_PlanNameDomain_b5996491-2e02-40fe-b73f-a091f367b7ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_2e9b71b1-8290-416e-bc8c-24a74571dd77" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:to="loc_us-gaap_VestingAxis_2e9b71b1-8290-416e-bc8c-24a74571dd77" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_2e9b71b1-8290-416e-bc8c-24a74571dd77_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_2e9b71b1-8290-416e-bc8c-24a74571dd77" xlink:to="loc_us-gaap_VestingDomain_2e9b71b1-8290-416e-bc8c-24a74571dd77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_075e17c2-e967-49d2-86f7-e8a436dfead9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_2e9b71b1-8290-416e-bc8c-24a74571dd77" xlink:to="loc_us-gaap_VestingDomain_075e17c2-e967-49d2-86f7-e8a436dfead9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_167782b7-319e-4ff5-ba21-4c368457aaf1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_167782b7-319e-4ff5-ba21-4c368457aaf1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_167782b7-319e-4ff5-ba21-4c368457aaf1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_167782b7-319e-4ff5-ba21-4c368457aaf1" xlink:to="loc_us-gaap_ClassOfStockDomain_167782b7-319e-4ff5-ba21-4c368457aaf1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1f3439a3-91a0-48ea-8ef6-fcee8d63f931" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_167782b7-319e-4ff5-ba21-4c368457aaf1" xlink:to="loc_us-gaap_ClassOfStockDomain_1f3439a3-91a0-48ea-8ef6-fcee8d63f931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d39b2baa-479f-4174-b827-b2fc5ec2a502" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8b6697d1-ec01-4f7c-ac09-05a896c1fe5e" xlink:to="loc_srt_RangeAxis_d39b2baa-479f-4174-b827-b2fc5ec2a502" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d39b2baa-479f-4174-b827-b2fc5ec2a502_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d39b2baa-479f-4174-b827-b2fc5ec2a502" xlink:to="loc_srt_RangeMember_d39b2baa-479f-4174-b827-b2fc5ec2a502_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3524042c-dd20-495c-9e70-b519ed070256" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d39b2baa-479f-4174-b827-b2fc5ec2a502" xlink:to="loc_srt_RangeMember_3524042c-dd20-495c-9e70-b519ed070256" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_5553b0b4-8ff8-4c89-a0ed-a2854f092238" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f4997cec-913a-48ce-9d32-4bce90dc6c96" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_5553b0b4-8ff8-4c89-a0ed-a2854f092238" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1a4f658f-16c4-4e45-8a48-d09a15fcf9ab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_5553b0b4-8ff8-4c89-a0ed-a2854f092238" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_1a4f658f-16c4-4e45-8a48-d09a15fcf9ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_913cd94c-6145-4875-bc7d-03093bf38faf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_5553b0b4-8ff8-4c89-a0ed-a2854f092238" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_913cd94c-6145-4875-bc7d-03093bf38faf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_b94aa39a-13c1-430e-9756-e8e97abe6b14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_5553b0b4-8ff8-4c89-a0ed-a2854f092238" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod_b94aa39a-13c1-430e-9756-e8e97abe6b14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_f23d32eb-2fa5-4c4a-b6af-7fbc85bc9aef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_c6622006-6a7c-42da-bdbd-982730b1113b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_5553b0b4-8ff8-4c89-a0ed-a2854f092238" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_c6622006-6a7c-42da-bdbd-982730b1113b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0765b6ad-22d0-48e6-a088-470e097cd90e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_5553b0b4-8ff8-4c89-a0ed-a2854f092238" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_0765b6ad-22d0-48e6-a088-470e097cd90e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_d9ca51d6-7c6f-441f-b8f6-51388a3beeb1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_5553b0b4-8ff8-4c89-a0ed-a2854f092238" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice_d9ca51d6-7c6f-441f-b8f6-51388a3beeb1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_d1f4f357-975e-4d13-a871-75ff54eb0fd8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/ShareBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#ShareBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/ShareBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_cae69a55-836d-4a8f-af58-35a9a10b962d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:to="loc_us-gaap_AwardTypeAxis_cae69a55-836d-4a8f-af58-35a9a10b962d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cae69a55-836d-4a8f-af58-35a9a10b962d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_cae69a55-836d-4a8f-af58-35a9a10b962d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cae69a55-836d-4a8f-af58-35a9a10b962d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_901efb55-9571-4e2e-afb5-723257ac3a3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_cae69a55-836d-4a8f-af58-35a9a10b962d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_901efb55-9571-4e2e-afb5-723257ac3a3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_e88bc5b4-40e9-4d04-a81c-b3d8467eccab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_901efb55-9571-4e2e-afb5-723257ac3a3e" xlink:to="loc_us-gaap_RestrictedStockMember_e88bc5b4-40e9-4d04-a81c-b3d8467eccab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_258a5508-c530-4371-a484-9987463430cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_901efb55-9571-4e2e-afb5-723257ac3a3e" xlink:to="loc_us-gaap_PerformanceSharesMember_258a5508-c530-4371-a484-9987463430cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_bfcfb588-c089-427f-bb75-3a350e0b978b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_901efb55-9571-4e2e-afb5-723257ac3a3e" xlink:to="loc_us-gaap_EmployeeStockOptionMember_bfcfb588-c089-427f-bb75-3a350e0b978b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateAxis_3f9e381c-b10c-4f31-b5d3-84df48ddc48b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:to="loc_us-gaap_AwardDateAxis_3f9e381c-b10c-4f31-b5d3-84df48ddc48b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_3f9e381c-b10c-4f31-b5d3-84df48ddc48b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardDateAxis_3f9e381c-b10c-4f31-b5d3-84df48ddc48b" xlink:to="loc_us-gaap_AwardDateDomain_3f9e381c-b10c-4f31-b5d3-84df48ddc48b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardDateDomain_98ec562e-9dd6-4050-b09e-2c4932e316c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardDateAxis_3f9e381c-b10c-4f31-b5d3-84df48ddc48b" xlink:to="loc_us-gaap_AwardDateDomain_98ec562e-9dd6-4050-b09e-2c4932e316c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_e00e703c-5ae6-4768-bf59-e1f880421a4d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:to="loc_us-gaap_GranteeStatusAxis_e00e703c-5ae6-4768-bf59-e1f880421a4d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_e00e703c-5ae6-4768-bf59-e1f880421a4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_e00e703c-5ae6-4768-bf59-e1f880421a4d" xlink:to="loc_us-gaap_GranteeStatusDomain_e00e703c-5ae6-4768-bf59-e1f880421a4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_b77f8cac-300d-421b-a1ad-abdd157ed148" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_e00e703c-5ae6-4768-bf59-e1f880421a4d" xlink:to="loc_us-gaap_GranteeStatusDomain_b77f8cac-300d-421b-a1ad-abdd157ed148" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementNonemployeeMember_a7a10df9-20f4-4d66-9dd6-84077d9c4f37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedPaymentArrangementNonemployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_b77f8cac-300d-421b-a1ad-abdd157ed148" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementNonemployeeMember_a7a10df9-20f4-4d66-9dd6-84077d9c4f37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_16e0dc88-481b-4880-a42f-d22fcaec58ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedPaymentArrangementEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_b77f8cac-300d-421b-a1ad-abdd157ed148" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_16e0dc88-481b-4880-a42f-d22fcaec58ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_e173949c-aeb7-4335-9197-984c54e1b6d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:to="loc_us-gaap_PlanNameAxis_e173949c-aeb7-4335-9197-984c54e1b6d9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e173949c-aeb7-4335-9197-984c54e1b6d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_e173949c-aeb7-4335-9197-984c54e1b6d9" xlink:to="loc_us-gaap_PlanNameDomain_e173949c-aeb7-4335-9197-984c54e1b6d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_0934240a-1245-4576-ac63-8c9e0280d6e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_e173949c-aeb7-4335-9197-984c54e1b6d9" xlink:to="loc_us-gaap_PlanNameDomain_0934240a-1245-4576-ac63-8c9e0280d6e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_A2022OmnibusIncentivePlanMember_46485e6b-0a52-4a88-8cd0-26ae67ff1f73" xlink:href="nnbr-20231231.xsd#nnbr_A2022OmnibusIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_0934240a-1245-4576-ac63-8c9e0280d6e7" xlink:to="loc_nnbr_A2022OmnibusIncentivePlanMember_46485e6b-0a52-4a88-8cd0-26ae67ff1f73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_OutsideOfIncentivePlansMember_917edf19-515f-4888-af36-add6ac91db18" xlink:href="nnbr-20231231.xsd#nnbr_OutsideOfIncentivePlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_0934240a-1245-4576-ac63-8c9e0280d6e7" xlink:to="loc_nnbr_OutsideOfIncentivePlansMember_917edf19-515f-4888-af36-add6ac91db18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_IncentivePlansMember_da9accaa-5c54-4489-b22d-357afad29fc4" xlink:href="nnbr-20231231.xsd#nnbr_IncentivePlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_0934240a-1245-4576-ac63-8c9e0280d6e7" xlink:to="loc_nnbr_IncentivePlansMember_da9accaa-5c54-4489-b22d-357afad29fc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_d1a30d1a-4a45-404c-9bc9-5e328a9fc0e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:to="loc_us-gaap_VestingAxis_d1a30d1a-4a45-404c-9bc9-5e328a9fc0e5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_d1a30d1a-4a45-404c-9bc9-5e328a9fc0e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_d1a30d1a-4a45-404c-9bc9-5e328a9fc0e5" xlink:to="loc_us-gaap_VestingDomain_d1a30d1a-4a45-404c-9bc9-5e328a9fc0e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_83f64878-dd86-4e16-a7eb-5f25c8391eb2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_d1a30d1a-4a45-404c-9bc9-5e328a9fc0e5" xlink:to="loc_us-gaap_VestingDomain_83f64878-dd86-4e16-a7eb-5f25c8391eb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_2e9154b6-31b7-4489-85b0-3775970a0a41" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_2e9154b6-31b7-4489-85b0-3775970a0a41" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_2e9154b6-31b7-4489-85b0-3775970a0a41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_2e9154b6-31b7-4489-85b0-3775970a0a41" xlink:to="loc_us-gaap_ClassOfStockDomain_2e9154b6-31b7-4489-85b0-3775970a0a41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1725f671-40b5-4467-b9b6-9a9e50bf9a53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_2e9154b6-31b7-4489-85b0-3775970a0a41" xlink:to="loc_us-gaap_ClassOfStockDomain_1725f671-40b5-4467-b9b6-9a9e50bf9a53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d6feaed5-d73b-4837-bf18-4328e2b831a2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c6c68d2b-fee9-4854-ab71-49c97b48434e" xlink:to="loc_srt_RangeAxis_d6feaed5-d73b-4837-bf18-4328e2b831a2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d6feaed5-d73b-4837-bf18-4328e2b831a2_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d6feaed5-d73b-4837-bf18-4328e2b831a2" xlink:to="loc_srt_RangeMember_d6feaed5-d73b-4837-bf18-4328e2b831a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_835ff595-7353-4734-a1b8-94e49bc2345f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d6feaed5-d73b-4837-bf18-4328e2b831a2" xlink:to="loc_srt_RangeMember_835ff595-7353-4734-a1b8-94e49bc2345f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_edb6b403-7dd8-4261-9615-32b72dd7956b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_edb6b403-7dd8-4261-9615-32b72dd7956b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_0afa64e7-a395-4f51-ac7a-72695f45e90b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_0afa64e7-a395-4f51-ac7a-72695f45e90b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_466bb0d8-e3ea-4843-b802-f451ccdbf951" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_466bb0d8-e3ea-4843-b802-f451ccdbf951" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c3bb5763-dfd0-475b-87ef-c663d9583a91" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c3bb5763-dfd0-475b-87ef-c663d9583a91" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice_1db09265-ddfa-47df-9d51-4a17853bcbc5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice_1db09265-ddfa-47df-9d51-4a17853bcbc5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1abf6b96-48c8-43b3-a7c4-fdf4b6857f5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_1abf6b96-48c8-43b3-a7c4-fdf4b6857f5a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_0b1d5486-7477-483d-ac8a-20604e391eeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_0b1d5486-7477-483d-ac8a-20604e391eeb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_37a2fc95-bd04-412e-baf5-54e1ed800362" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_37a2fc95-bd04-412e-baf5-54e1ed800362" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfAward_3ffe47a6-d383-4959-be52-8143b0edba6e" xlink:href="nnbr-20231231.xsd#nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfAward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_nnbr_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfAward_3ffe47a6-d383-4959-be52-8143b0edba6e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_de46a803-da02-40a2-a1e9-9170eb71f3d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_de46a803-da02-40a2-a1e9-9170eb71f3d1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_53487f47-33a6-4df0-afb1-4c1a7cecf2bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_572bde5e-5067-4f82-841c-ea20cab7cd0e" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_53487f47-33a6-4df0-afb1-4c1a7cecf2bc" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#AccumulatedOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_f5b7b3df-2df5-4c78-a03a-be93fbdb8c66" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_95a68fa6-ce8d-4ecc-a377-9948be19ff0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_f5b7b3df-2df5-4c78-a03a-be93fbdb8c66" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_95a68fa6-ce8d-4ecc-a377-9948be19ff0c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_26f62a91-8f79-4a2c-b0ed-3b1ed237c6cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_95a68fa6-ce8d-4ecc-a377-9948be19ff0c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_26f62a91-8f79-4a2c-b0ed-3b1ed237c6cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_26f62a91-8f79-4a2c-b0ed-3b1ed237c6cb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_26f62a91-8f79-4a2c-b0ed-3b1ed237c6cb" xlink:to="loc_us-gaap_EquityComponentDomain_26f62a91-8f79-4a2c-b0ed-3b1ed237c6cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_8dd2df5a-89f9-449e-addf-0acae2198108" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_26f62a91-8f79-4a2c-b0ed-3b1ed237c6cb" xlink:to="loc_us-gaap_EquityComponentDomain_8dd2df5a-89f9-449e-addf-0acae2198108" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f4e05345-959a-4006-99e0-5fff5fd5eb7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_8dd2df5a-89f9-449e-addf-0acae2198108" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f4e05345-959a-4006-99e0-5fff5fd5eb7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_cde5bb86-b2ab-4ce6-9e30-a3aa0b5072ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f4e05345-959a-4006-99e0-5fff5fd5eb7a" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_cde5bb86-b2ab-4ce6-9e30-a3aa0b5072ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_77893e6b-b40f-48ad-a1b8-1b7f008eb7bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f4e05345-959a-4006-99e0-5fff5fd5eb7a" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_77893e6b-b40f-48ad-a1b8-1b7f008eb7bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_AOCIAttributableToParentTaxPortionMember_084d5368-67e7-4895-a6ef-81257e667485" xlink:href="nnbr-20231231.xsd#nnbr_AOCIAttributableToParentTaxPortionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f4e05345-959a-4006-99e0-5fff5fd5eb7a" xlink:to="loc_nnbr_AOCIAttributableToParentTaxPortionMember_084d5368-67e7-4895-a6ef-81257e667485" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_67b5d871-f069-4c6c-abd3-81ccdc7e2dff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_95a68fa6-ce8d-4ecc-a377-9948be19ff0c" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_67b5d871-f069-4c6c-abd3-81ccdc7e2dff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_67b5d871-f069-4c6c-abd3-81ccdc7e2dff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_67b5d871-f069-4c6c-abd3-81ccdc7e2dff" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_67b5d871-f069-4c6c-abd3-81ccdc7e2dff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_4f6fbe16-8b18-4c4f-bd25-856cc58e1daf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_67b5d871-f069-4c6c-abd3-81ccdc7e2dff" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_4f6fbe16-8b18-4c4f-bd25-856cc58e1daf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_0ae223be-e247-45fb-9583-7dc3496be975" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_4f6fbe16-8b18-4c4f-bd25-856cc58e1daf" xlink:to="loc_us-gaap_InterestExpenseMember_0ae223be-e247-45fb-9583-7dc3496be975" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_LossOnInterestRateSwapMember_a3cf3a24-aa41-45b2-beef-c3817e405fa9" xlink:href="nnbr-20231231.xsd#nnbr_LossOnInterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_4f6fbe16-8b18-4c4f-bd25-856cc58e1daf" xlink:to="loc_nnbr_LossOnInterestRateSwapMember_a3cf3a24-aa41-45b2-beef-c3817e405fa9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_55b3a711-8690-4634-9194-572642185755" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_95a68fa6-ce8d-4ecc-a377-9948be19ff0c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_55b3a711-8690-4634-9194-572642185755" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_55b3a711-8690-4634-9194-572642185755_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_55b3a711-8690-4634-9194-572642185755" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_55b3a711-8690-4634-9194-572642185755_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_e3dd5978-ec0f-48be-a199-232f4f064763" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_55b3a711-8690-4634-9194-572642185755" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_e3dd5978-ec0f-48be-a199-232f4f064763" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_23b37a66-8a93-44d8-a64d-5d24af5f196d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_e3dd5978-ec0f-48be-a199-232f4f064763" xlink:to="loc_us-gaap_InterestRateSwapMember_23b37a66-8a93-44d8-a64d-5d24af5f196d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_f5b7b3df-2df5-4c78-a03a-be93fbdb8c66" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_03f4c38e-8a1b-4db0-a4e2-d31aeb2a69b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_03f4c38e-8a1b-4db0-a4e2-d31aeb2a69b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_fe07d5ad-a082-4a37-aad1-7a27d5aa316e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_fe07d5ad-a082-4a37-aad1-7a27d5aa316e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_1aa0498f-9231-48ff-9834-e8c21af46080" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_1aa0498f-9231-48ff-9834-e8c21af46080" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_618f669d-0be7-4ab8-ac5a-451d1943503e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_618f669d-0be7-4ab8-ac5a-451d1943503e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_71491a1e-1a5e-4570-bb50-ca7cffad28fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_71491a1e-1a5e-4570-bb50-ca7cffad28fc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_8afe6e02-a6b6-4005-9d98-258078d5b02d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_8afe6e02-a6b6-4005-9d98-258078d5b02d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_6cf3ab27-8005-48ae-8fa8-d7fb15033192" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_6cf3ab27-8005-48ae-8fa8-d7fb15033192" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_274e3dc3-3007-4479-a801-d9e1d7041c94" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_274e3dc3-3007-4479-a801-d9e1d7041c94" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_738677d1-ed81-4d91-851e-c7fd25ed2b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_738677d1-ed81-4d91-851e-c7fd25ed2b0d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_408f7e6a-a358-4e12-a22c-926b58ce6345" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_408f7e6a-a358-4e12-a22c-926b58ce6345" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_36547f20-823d-401c-9380-8e46e96cb484" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax_36547f20-823d-401c-9380-8e46e96cb484" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_0b2a597f-73cd-4b86-b88a-4427618cc66b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationTax_0b2a597f-73cd-4b86-b88a-4427618cc66b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax_cac9c678-1ff4-4417-aea1-653000aa04e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax_cac9c678-1ff4-4417-aea1-653000aa04e9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_009d4824-9244-4c98-bead-bb2fd3bf75a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent_009d4824-9244-4c98-bead-bb2fd3bf75a0" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_7d88c6b8-62f7-48d3-9a38-a7f583f0fbfe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_7d88c6b8-62f7-48d3-9a38-a7f583f0fbfe" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_53c99fb7-399e-47e5-b0da-7c57469f752a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_e01c3c69-ba85-416d-97c3-94ff1e442aa1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_704a0d3d-6530-461a-9829-90fd99419619" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_e01c3c69-ba85-416d-97c3-94ff1e442aa1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_8cf6d788-b51e-4fd4-8e4e-c1119411f4e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_f5b7b3df-2df5-4c78-a03a-be93fbdb8c66" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_8cf6d788-b51e-4fd4-8e4e-c1119411f4e8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/FairValueMeasurementsAdditionalInformationDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#FairValueMeasurementsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/FairValueMeasurementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_44a5e390-534f-43dd-8029-82c7c44f02d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_44a5e390-534f-43dd-8029-82c7c44f02d8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_97238e64-c936-4643-b0a8-3cfa0d981633" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_44a5e390-534f-43dd-8029-82c7c44f02d8" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_97238e64-c936-4643-b0a8-3cfa0d981633" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_97238e64-c936-4643-b0a8-3cfa0d981633_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_97238e64-c936-4643-b0a8-3cfa0d981633" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_97238e64-c936-4643-b0a8-3cfa0d981633_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_54ac8fde-b641-48e6-814d-7608651ff644" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_97238e64-c936-4643-b0a8-3cfa0d981633" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_54ac8fde-b641-48e6-814d-7608651ff644" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_b11a4606-1020-4b51-a986-097e03d56d25" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_54ac8fde-b641-48e6-814d-7608651ff644" xlink:to="loc_us-gaap_InterestRateSwapMember_b11a4606-1020-4b51-a986-097e03d56d25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_53b4b618-d463-4654-a612-bc3356ad2537" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_44a5e390-534f-43dd-8029-82c7c44f02d8" xlink:to="loc_us-gaap_StatementClassOfStockAxis_53b4b618-d463-4654-a612-bc3356ad2537" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_53b4b618-d463-4654-a612-bc3356ad2537_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_53b4b618-d463-4654-a612-bc3356ad2537" xlink:to="loc_us-gaap_ClassOfStockDomain_53b4b618-d463-4654-a612-bc3356ad2537_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_b6d58be1-54ee-40fa-b3de-f33b890928c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_53b4b618-d463-4654-a612-bc3356ad2537" xlink:to="loc_us-gaap_ClassOfStockDomain_b6d58be1-54ee-40fa-b3de-f33b890928c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesDPreferredStockMember_b47f702e-38a3-4ac9-b1db-7ab0c4b4df46" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesDPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_b6d58be1-54ee-40fa-b3de-f33b890928c2" xlink:to="loc_us-gaap_SeriesDPreferredStockMember_b47f702e-38a3-4ac9-b1db-7ab0c4b4df46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_71bc8b7a-901d-456c-8f7d-9337892dae99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_b6d58be1-54ee-40fa-b3de-f33b890928c2" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_71bc8b7a-901d-456c-8f7d-9337892dae99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TermLoanFacilityMember_ad872a5a-aafd-4838-b5e3-75ee9105e565" xlink:href="nnbr-20231231.xsd#nnbr_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_b6d58be1-54ee-40fa-b3de-f33b890928c2" xlink:to="loc_nnbr_TermLoanFacilityMember_ad872a5a-aafd-4838-b5e3-75ee9105e565" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_64facfd3-1ec5-46e5-b106-bc72e470021c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_44a5e390-534f-43dd-8029-82c7c44f02d8" xlink:to="loc_srt_RangeAxis_64facfd3-1ec5-46e5-b106-bc72e470021c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_64facfd3-1ec5-46e5-b106-bc72e470021c_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_64facfd3-1ec5-46e5-b106-bc72e470021c" xlink:to="loc_srt_RangeMember_64facfd3-1ec5-46e5-b106-bc72e470021c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a4a854d3-2b42-4e4d-a5eb-703dde562193" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_64facfd3-1ec5-46e5-b106-bc72e470021c" xlink:to="loc_srt_RangeMember_a4a854d3-2b42-4e4d-a5eb-703dde562193" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_179da104-9e7a-4d26-a727-9228eabd643f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a4a854d3-2b42-4e4d-a5eb-703dde562193" xlink:to="loc_srt_MaximumMember_179da104-9e7a-4d26-a727-9228eabd643f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1b9b3cca-e12c-44a3-a575-df5d4389860f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a4a854d3-2b42-4e4d-a5eb-703dde562193" xlink:to="loc_srt_MinimumMember_1b9b3cca-e12c-44a3-a575-df5d4389860f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_d43735a5-5450-4554-a3dd-90c647512129" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_44a5e390-534f-43dd-8029-82c7c44f02d8" xlink:to="loc_us-gaap_FinancialInstrumentAxis_d43735a5-5450-4554-a3dd-90c647512129" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d43735a5-5450-4554-a3dd-90c647512129_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_d43735a5-5450-4554-a3dd-90c647512129" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d43735a5-5450-4554-a3dd-90c647512129_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f82fbd54-64a5-4a3d-83ae-3c4d5ce4edeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_d43735a5-5450-4554-a3dd-90c647512129" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f82fbd54-64a5-4a3d-83ae-3c4d5ce4edeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_July222021Member_60444e15-e8e1-4313-8f66-4fd46f33f5cc" xlink:href="nnbr-20231231.xsd#nnbr_July222021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f82fbd54-64a5-4a3d-83ae-3c4d5ce4edeb" xlink:to="loc_nnbr_July222021Member_60444e15-e8e1-4313-8f66-4fd46f33f5cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_February82019Member_7fa5608e-7b61-4fa8-a4c5-80b9c3b0e5d1" xlink:href="nnbr-20231231.xsd#nnbr_February82019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f82fbd54-64a5-4a3d-83ae-3c4d5ce4edeb" xlink:to="loc_nnbr_February82019Member_7fa5608e-7b61-4fa8-a4c5-80b9c3b0e5d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_31b3c411-06c0-4d9e-b95e-bf2f654ccb84" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_44a5e390-534f-43dd-8029-82c7c44f02d8" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_31b3c411-06c0-4d9e-b95e-bf2f654ccb84" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_31b3c411-06c0-4d9e-b95e-bf2f654ccb84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_31b3c411-06c0-4d9e-b95e-bf2f654ccb84" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_31b3c411-06c0-4d9e-b95e-bf2f654ccb84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5b491639-e44e-4b36-8779-8a2b4f4e24ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_31b3c411-06c0-4d9e-b95e-bf2f654ccb84" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5b491639-e44e-4b36-8779-8a2b4f4e24ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_4668a56b-d6d6-42f5-91c1-f531de8f9e4e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5b491639-e44e-4b36-8779-8a2b4f4e24ca" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_4668a56b-d6d6-42f5-91c1-f531de8f9e4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_929d54ec-e829-4593-8a2d-ec8a4cf4077e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_44a5e390-534f-43dd-8029-82c7c44f02d8" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_929d54ec-e829-4593-8a2d-ec8a4cf4077e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_929d54ec-e829-4593-8a2d-ec8a4cf4077e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_929d54ec-e829-4593-8a2d-ec8a4cf4077e" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_929d54ec-e829-4593-8a2d-ec8a4cf4077e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_87f756e1-c5b0-4730-9913-fb4f8cf09311" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_929d54ec-e829-4593-8a2d-ec8a4cf4077e" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_87f756e1-c5b0-4730-9913-fb4f8cf09311" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_68afecfd-cadb-4689-bf40-ebe11849e7f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_87f756e1-c5b0-4730-9913-fb4f8cf09311" xlink:to="loc_us-gaap_SubsequentEventMember_68afecfd-cadb-4689-bf40-ebe11849e7f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_59932e27-8423-4db7-8856-e609b24b0040" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_59932e27-8423-4db7-8856-e609b24b0040" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstandingTerm_18f7d5c5-a5cd-4531-b0ca-c8e63bdbc218" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantsAndRightsOutstandingTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_WarrantsAndRightsOutstandingTerm_18f7d5c5-a5cd-4531-b0ca-c8e63bdbc218" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_71a04bf7-a0b8-41bd-843d-d0cbe50d02df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_DerivativeNotionalAmount_71a04bf7-a0b8-41bd-843d-d0cbe50d02df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_7169010c-ca0e-466f-910e-812799eebedc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_7169010c-ca0e-466f-910e-812799eebedc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForHedgeInvestingActivities_57bbedf2-dd43-4767-b929-59494a83f0fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForHedgeInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_PaymentsForHedgeInvestingActivities_57bbedf2-dd43-4767-b929-59494a83f0fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLossCashFlowHedgeCumulativeGainLossAfterTax_fb1b0187-901a-4da1-82d7-4cc4769efe51" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AociLossCashFlowHedgeCumulativeGainLossAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_AociLossCashFlowHedgeCumulativeGainLossAfterTax_fb1b0187-901a-4da1-82d7-4cc4769efe51" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_842c956a-2ab9-45b0-931a-a7f9f5446396" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_LongTermDebtFairValue_842c956a-2ab9-45b0-931a-a7f9f5446396" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_PreferredStockChangeInControlPutFeatureProbabilityPercentage_344e7ce9-736b-4909-a813-f120d41eb939" xlink:href="nnbr-20231231.xsd#nnbr_PreferredStockChangeInControlPutFeatureProbabilityPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_nnbr_PreferredStockChangeInControlPutFeatureProbabilityPercentage_344e7ce9-736b-4909-a813-f120d41eb939" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_bed610b1-cd1a-4848-b17d-ee35bcf631af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_bed610b1-cd1a-4848-b17d-ee35bcf631af" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_TemporaryEquityLiquidationPreferencePercentage_571ef6ce-40f6-4904-9c50-a62ec8f63b05" xlink:href="nnbr-20231231.xsd#nnbr_TemporaryEquityLiquidationPreferencePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_nnbr_TemporaryEquityLiquidationPreferencePercentage_571ef6ce-40f6-4904-9c50-a62ec8f63b05" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights_b694d635-bff7-4fdb-bbca-cc30d86ceba8" xlink:href="nnbr-20231231.xsd#nnbr_ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_nnbr_ClassOfWarrantOrRightAdjustedExercisePriceOfWarrantsOrRights_b694d635-bff7-4fdb-bbca-cc30d86ceba8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_bb43b41c-58e8-49ac-bf70-e0d50a37e933" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_LongTermDebt_bb43b41c-58e8-49ac-bf70-e0d50a37e933" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_a33a2f0f-8299-4e67-9bef-a3b389010579" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_a33a2f0f-8299-4e67-9bef-a3b389010579" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_ProceedsFromDerivativeInstrumentOperatingActivities_41163a96-f3c6-4b5f-bbe6-983aad4efce0" xlink:href="nnbr-20231231.xsd#nnbr_ProceedsFromDerivativeInstrumentOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_nnbr_ProceedsFromDerivativeInstrumentOperatingActivities_41163a96-f3c6-4b5f-bbe6-983aad4efce0" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_44b25b94-8ab2-4859-b270-3874322668c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_SharesIssued_44b25b94-8ab2-4859-b270-3874322668c4" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_900ab5cd-2afb-4e9e-8c57-5b3582fdcb18" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_900ab5cd-2afb-4e9e-8c57-5b3582fdcb18" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_7f05f104-b487-4398-8da4-7a59e5dd0b02" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_28d7b985-5640-42ef-be21-30fe78cf1d8d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_7f05f104-b487-4398-8da4-7a59e5dd0b02" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/FairValueMeasurementsFairValueofPreferredStockDerivativeDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#FairValueMeasurementsFairValueofPreferredStockDerivativeDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/FairValueMeasurementsFairValueofPreferredStockDerivativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_73bc366c-09ca-49e5-ae00-1f70de89e137" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4872c232-93e5-48fc-90a1-cb4f0c9652df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_73bc366c-09ca-49e5-ae00-1f70de89e137" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4872c232-93e5-48fc-90a1-cb4f0c9652df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b2729c7c-6e70-484c-a284-054549c471de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4872c232-93e5-48fc-90a1-cb4f0c9652df" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b2729c7c-6e70-484c-a284-054549c471de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b2729c7c-6e70-484c-a284-054549c471de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b2729c7c-6e70-484c-a284-054549c471de" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b2729c7c-6e70-484c-a284-054549c471de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5a08bcf3-d5b9-4d8b-b245-eabe57c8c0c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b2729c7c-6e70-484c-a284-054549c471de" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5a08bcf3-d5b9-4d8b-b245-eabe57c8c0c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_88da9f4a-bbb2-48d3-85e3-de721ba43073" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5a08bcf3-d5b9-4d8b-b245-eabe57c8c0c7" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_88da9f4a-bbb2-48d3-85e3-de721ba43073" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_89e6df33-a98a-4219-8c14-bfd38deca4dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5a08bcf3-d5b9-4d8b-b245-eabe57c8c0c7" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_89e6df33-a98a-4219-8c14-bfd38deca4dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_b9c4dce1-d48a-4926-a26d-be286c00c31a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5a08bcf3-d5b9-4d8b-b245-eabe57c8c0c7" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_b9c4dce1-d48a-4926-a26d-be286c00c31a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_dcc7d18d-90ff-4019-8f85-59b39873f628" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_4872c232-93e5-48fc-90a1-cb4f0c9652df" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_dcc7d18d-90ff-4019-8f85-59b39873f628" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_dcc7d18d-90ff-4019-8f85-59b39873f628_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_dcc7d18d-90ff-4019-8f85-59b39873f628" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_dcc7d18d-90ff-4019-8f85-59b39873f628_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_4964a46a-f3c2-49de-95ae-2b4dcd8b7179" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_dcc7d18d-90ff-4019-8f85-59b39873f628" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_4964a46a-f3c2-49de-95ae-2b4dcd8b7179" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_9318014f-64b8-4782-8449-15a52028c301" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4964a46a-f3c2-49de-95ae-2b4dcd8b7179" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_9318014f-64b8-4782-8449-15a52028c301" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_14eecc44-9203-498a-b7c1-ccc99986b3c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_4964a46a-f3c2-49de-95ae-2b4dcd8b7179" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_14eecc44-9203-498a-b7c1-ccc99986b3c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_4484e83c-2c15-4ef2-bbaa-3883fa9b369c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_73bc366c-09ca-49e5-ae00-1f70de89e137" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_4484e83c-2c15-4ef2-bbaa-3883fa9b369c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_ccfe020a-b8f5-4345-bd90-f7608685cd8f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_73bc366c-09ca-49e5-ae00-1f70de89e137" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_ccfe020a-b8f5-4345-bd90-f7608685cd8f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/FairValueMeasurementsEffectofInterestRateSwapDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#FairValueMeasurementsEffectofInterestRateSwapDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/FairValueMeasurementsEffectofInterestRateSwapDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_950f21d1-7742-43a9-bd24-a0bf5120280f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_ea11f15d-43a9-4ca0-8247-2a246e4e9163" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_950f21d1-7742-43a9-bd24-a0bf5120280f" xlink:to="loc_us-gaap_DerivativeTable_ea11f15d-43a9-4ca0-8247-2a246e4e9163" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_fe041792-2fcc-4fe3-9e18-fb2371500144" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_ea11f15d-43a9-4ca0-8247-2a246e4e9163" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_fe041792-2fcc-4fe3-9e18-fb2371500144" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_fe041792-2fcc-4fe3-9e18-fb2371500144_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_fe041792-2fcc-4fe3-9e18-fb2371500144" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_fe041792-2fcc-4fe3-9e18-fb2371500144_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_23454cfe-7bf9-4615-9747-a4f9ac88fbd7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_fe041792-2fcc-4fe3-9e18-fb2371500144" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_23454cfe-7bf9-4615-9747-a4f9ac88fbd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_9f710d05-f885-4288-8bb7-be69f06a6642" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_23454cfe-7bf9-4615-9747-a4f9ac88fbd7" xlink:to="loc_us-gaap_InterestRateSwapMember_9f710d05-f885-4288-8bb7-be69f06a6642" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_4ea48b14-5baf-4d9e-a49a-f7c2cf7d4aec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_950f21d1-7742-43a9-bd24-a0bf5120280f" xlink:to="loc_us-gaap_InterestExpense_4ea48b14-5baf-4d9e-a49a-f7c2cf7d4aec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_nnbr_DerivativeInstrumentsPaymentExpense_39e3fe6a-946c-4496-a37f-70be377fa9b1" xlink:href="nnbr-20231231.xsd#nnbr_DerivativeInstrumentsPaymentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_950f21d1-7742-43a9-bd24-a0bf5120280f" xlink:to="loc_nnbr_DerivativeInstrumentsPaymentExpense_39e3fe6a-946c-4496-a37f-70be377fa9b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_7ec688bf-b12e-457b-bf4a-27a38fd4c225" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_950f21d1-7742-43a9-bd24-a0bf5120280f" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_7ec688bf-b12e-457b-bf4a-27a38fd4c225" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredonaRecurringBasisDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#FairValueMeasurementsAssetsandLiabilitiesMeasuredonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_8d4fc7b9-a06c-45b9-8c7a-a0e59aef95a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_8d4fc7b9-a06c-45b9-8c7a-a0e59aef95a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_64fe573e-0201-40ed-a780-a7728ec705a4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_8d4fc7b9-a06c-45b9-8c7a-a0e59aef95a5" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_64fe573e-0201-40ed-a780-a7728ec705a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_64fe573e-0201-40ed-a780-a7728ec705a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_64fe573e-0201-40ed-a780-a7728ec705a4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_64fe573e-0201-40ed-a780-a7728ec705a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_52e6f1e4-7462-4574-8d5b-d7e2fa11b9e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_64fe573e-0201-40ed-a780-a7728ec705a4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_52e6f1e4-7462-4574-8d5b-d7e2fa11b9e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_bd0bfaec-7edd-4f07-ba92-1c636989452d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_52e6f1e4-7462-4574-8d5b-d7e2fa11b9e2" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_bd0bfaec-7edd-4f07-ba92-1c636989452d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_6bd8adfb-9125-45ca-bfa5-afe7276a19c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_52e6f1e4-7462-4574-8d5b-d7e2fa11b9e2" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_6bd8adfb-9125-45ca-bfa5-afe7276a19c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_68076b5b-5c7c-43b7-9d8a-a5cd6e5ae27e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_52e6f1e4-7462-4574-8d5b-d7e2fa11b9e2" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_68076b5b-5c7c-43b7-9d8a-a5cd6e5ae27e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_cdb4a847-217b-4a7e-b159-45bba4c2001f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_8d4fc7b9-a06c-45b9-8c7a-a0e59aef95a5" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_cdb4a847-217b-4a7e-b159-45bba4c2001f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_cdb4a847-217b-4a7e-b159-45bba4c2001f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_cdb4a847-217b-4a7e-b159-45bba4c2001f" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_cdb4a847-217b-4a7e-b159-45bba4c2001f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_182d3329-584a-4ab8-9ca2-768d5a3fb12b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_cdb4a847-217b-4a7e-b159-45bba4c2001f" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_182d3329-584a-4ab8-9ca2-768d5a3fb12b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_f2c05042-e0dc-438b-af9b-70a124495e21" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_182d3329-584a-4ab8-9ca2-768d5a3fb12b" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_f2c05042-e0dc-438b-af9b-70a124495e21" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_84c18983-e09e-4814-8f8d-47cc95fc9e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_DerivativeAssetsCurrent_84c18983-e09e-4814-8f8d-47cc95fc9e2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_7a96d4f3-6cff-4aa0-86ad-51521ce245da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_DerivativeAssetsNoncurrent_7a96d4f3-6cff-4aa0-86ad-51521ce245da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesCurrent_c43f5dd3-ae8f-448a-8885-a96afd1d43da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_DerivativeLiabilitiesCurrent_c43f5dd3-ae8f-448a-8885-a96afd1d43da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_b25d4838-f343-47d1-b6b0-c36b60d6c4d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_DerivativeLiabilitiesNoncurrent_b25d4838-f343-47d1-b6b0-c36b60d6c4d3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_70d0bf75-28e0-4ebc-b0e7-130b463523ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_70d0bf75-28e0-4ebc-b0e7-130b463523ea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration_68e32d1b-66fc-4b69-bb3a-6f1b22084744" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration_68e32d1b-66fc-4b69-bb3a-6f1b22084744" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNoncurrentStatementOfFinancialPositionExtensibleEnumeration_22a595c5-988a-483c-b15e-3fcbcd7a5c1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssetNoncurrentStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_DerivativeAssetNoncurrentStatementOfFinancialPositionExtensibleEnumeration_22a595c5-988a-483c-b15e-3fcbcd7a5c1f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList_1c5d6223-dd9e-454e-a035-99fa9d5f6c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_2dec975c-23f9-41f1-abf5-016c15207c4d" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList_1c5d6223-dd9e-454e-a035-99fa9d5f6c0f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.nninc.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="nnbr-20231231.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.nninc.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_fe8daba8-16dc-40d0-a679-63d035587904" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_ddc5b4ac-2142-4e47-ae7e-114e85c3dcfb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_fe8daba8-16dc-40d0-a679-63d035587904" xlink:to="loc_us-gaap_SubsequentEventTable_ddc5b4ac-2142-4e47-ae7e-114e85c3dcfb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_433eb9bf-4558-4a70-a9b1-d81c1365ce63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_ddc5b4ac-2142-4e47-ae7e-114e85c3dcfb" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_433eb9bf-4558-4a70-a9b1-d81c1365ce63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_433eb9bf-4558-4a70-a9b1-d81c1365ce63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_433eb9bf-4558-4a70-a9b1-d81c1365ce63" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_433eb9bf-4558-4a70-a9b1-d81c1365ce63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_1be6d536-5c32-48fa-a88d-df255d1cc78e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_433eb9bf-4558-4a70-a9b1-d81c1365ce63" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_1be6d536-5c32-48fa-a88d-df255d1cc78e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_00eb18f9-3cba-47a2-abae-07a3f16b5cda" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_1be6d536-5c32-48fa-a88d-df255d1cc78e" xlink:to="loc_us-gaap_SubsequentEventMember_00eb18f9-3cba-47a2-abae-07a3f16b5cda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfBuildings_c27a8f0d-2ea6-4bec-841c-e168aca15f8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromSaleOfBuildings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_fe8daba8-16dc-40d0-a679-63d035587904" xlink:to="loc_us-gaap_ProceedsFromSaleOfBuildings_c27a8f0d-2ea6-4bec-841c-e168aca15f8e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-roles-2023.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockMember" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_PerformanceSharesMember" xlink:type="arc" order="5"/>
  </link:definitionLink>
</link:linkbase>
