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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2023 Workiva-->
<!--r:a89d01f1-11c2-4d18-8d3d-557027010697,g:bdd56a67-f59c-4916-81bb-1fbbd30f154e-->
<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.belden.com/role/CONDENSEDCONSOLIDATEDSTOCKHOLDERSEQUITYSTATEMENTS" xlink:type="simple" xlink:href="bdc-20231001.xsd#CONDENSEDCONSOLIDATEDSTOCKHOLDERSEQUITYSTATEMENTS"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/CONDENSEDCONSOLIDATEDSTOCKHOLDERSEQUITYSTATEMENTS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_5573c2d5-0bea-4e16-9b0a-238be85bd04a" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5573c2d5-0bea-4e16-9b0a-238be85bd04a" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_d3c3ceb2-2ff7-4386-ae3e-270c6d7e4d8f" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_d3c3ceb2-2ff7-4386-ae3e-270c6d7e4d8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_88d3764b-f9a0-49e1-ab5f-513ae618e237" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_88d3764b-f9a0-49e1-ab5f-513ae618e237" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_4ec87694-276b-4079-820e-815c0af43806" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_TreasuryStockCommonShares_4ec87694-276b-4079-820e-815c0af43806" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_b6412706-843c-4b40-8e71-c4381486c5e3" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_ProfitLoss_b6412706-843c-4b40-8e71-c4381486c5e3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_04e43ab5-fe81-4ed6-81b1-58940092e63d" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_04e43ab5-fe81-4ed6-81b1-58940092e63d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_e34de036-d890-48d6-bf63-d31175d542ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_e34de036-d890-48d6-bf63-d31175d542ad" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_5d9bb0ec-394a-4e62-8c0e-8baf383f4dc5" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_5d9bb0ec-394a-4e62-8c0e-8baf383f4dc5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation_c88339d5-7678-4272-93c6-00cd168c911e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_NoncontrollingInterestDecreaseFromDeconsolidation_c88339d5-7678-4272-93c6-00cd168c911e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_StockIssuedDuringPeriodValueStockContributionRetirementSavingsPlan_156f6534-ddc7-43d2-9194-4f8f58ef7408" xlink:href="bdc-20231001.xsd#bdc_StockIssuedDuringPeriodValueStockContributionRetirementSavingsPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_bdc_StockIssuedDuringPeriodValueStockContributionRetirementSavingsPlan_156f6534-ddc7-43d2-9194-4f8f58ef7408" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_StockIssuedDuringPeriodSharesStockContributionRetirementSavingsPlan_e39b266a-ff60-4754-bb8b-affe838ceab8" xlink:href="bdc-20231001.xsd#bdc_StockIssuedDuringPeriodSharesStockContributionRetirementSavingsPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_bdc_StockIssuedDuringPeriodSharesStockContributionRetirementSavingsPlan_e39b266a-ff60-4754-bb8b-affe838ceab8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_53156755-e4c7-4e1c-9be5-2f6c4213cf42" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_53156755-e4c7-4e1c-9be5-2f6c4213cf42" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_15e410db-5577-4569-8ecb-855827f5a689" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_15e410db-5577-4569-8ecb-855827f5a689" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_b3551967-436e-4f5c-b181-3810bf81eac8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_b3551967-436e-4f5c-b181-3810bf81eac8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_6cc00f06-898a-47c8-ba37-a26f1fbc03cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_6cc00f06-898a-47c8-ba37-a26f1fbc03cb" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_StockRepurchasedDuringPeriodNetOfExciseTaxShares_46d11ac5-ef9e-42c1-b162-b28f4db96dc2" xlink:href="bdc-20231001.xsd#bdc_StockRepurchasedDuringPeriodNetOfExciseTaxShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_bdc_StockRepurchasedDuringPeriodNetOfExciseTaxShares_46d11ac5-ef9e-42c1-b162-b28f4db96dc2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_StockRepurchasedDuringPeriodNetOfExciseTaxValue_60ef0745-c39f-406b-80d9-6483149b3c37" xlink:href="bdc-20231001.xsd#bdc_StockRepurchasedDuringPeriodNetOfExciseTaxValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_bdc_StockRepurchasedDuringPeriodNetOfExciseTaxValue_60ef0745-c39f-406b-80d9-6483149b3c37" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_1bd02f7f-1bcf-4ab2-a60d-0320f1e1f11f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_1bd02f7f-1bcf-4ab2-a60d-0320f1e1f11f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_de00fc28-b86c-4137-afd0-f192f13b65f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_de00fc28-b86c-4137-afd0-f192f13b65f6" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_dacc1db6-e2c7-4c97-ade9-b983945cb49f" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_dacc1db6-e2c7-4c97-ade9-b983945cb49f" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_479d471a-429e-40ba-bfdd-fca228b840f6" 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_IncreaseDecreaseInStockholdersEquityRollForward_14762842-14ef-45da-a681-9ad84a375388" xlink:to="loc_us-gaap_DividendsCommonStockCash_479d471a-429e-40ba-bfdd-fca228b840f6" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_49c604c0-82cc-40b0-a5da-a96ab045ccc8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_465c7694-e271-4a6f-9048-1245170f0cac" 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_TreasuryStockCommonShares_efe85428-c0e2-421a-b305-617c2f6dfb75" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_4f7a467a-0fb1-4f2a-b2fd-4cae8bd5ddeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5573c2d5-0bea-4e16-9b0a-238be85bd04a" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_4f7a467a-0fb1-4f2a-b2fd-4cae8bd5ddeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_bc8e8738-3dd0-48b8-8e8e-8b9d51d3d69e" 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_5573c2d5-0bea-4e16-9b0a-238be85bd04a" xlink:to="loc_us-gaap_StatementTable_bc8e8738-3dd0-48b8-8e8e-8b9d51d3d69e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_213cb3bb-32c0-4389-bbfc-be55607bffb9" 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_bc8e8738-3dd0-48b8-8e8e-8b9d51d3d69e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_213cb3bb-32c0-4389-bbfc-be55607bffb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_213cb3bb-32c0-4389-bbfc-be55607bffb9_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_213cb3bb-32c0-4389-bbfc-be55607bffb9" xlink:to="loc_us-gaap_EquityComponentDomain_213cb3bb-32c0-4389-bbfc-be55607bffb9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_fff3f79c-2790-4661-ab83-29cc2de1368c" 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_213cb3bb-32c0-4389-bbfc-be55607bffb9" xlink:to="loc_us-gaap_EquityComponentDomain_fff3f79c-2790-4661-ab83-29cc2de1368c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_0c0f5248-c52c-41af-9e33-25aabd65cbd8" 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_fff3f79c-2790-4661-ab83-29cc2de1368c" xlink:to="loc_us-gaap_CommonStockMember_0c0f5248-c52c-41af-9e33-25aabd65cbd8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_67d31038-81e4-4d07-af6a-5c81d4585c8c" 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_fff3f79c-2790-4661-ab83-29cc2de1368c" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_67d31038-81e4-4d07-af6a-5c81d4585c8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_9b2720a2-a92c-42b8-9f3d-0942b1d91c3b" 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_fff3f79c-2790-4661-ab83-29cc2de1368c" xlink:to="loc_us-gaap_RetainedEarningsMember_9b2720a2-a92c-42b8-9f3d-0942b1d91c3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_77f31c2c-e25f-4fb6-b663-e2890cb6cbbf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_fff3f79c-2790-4661-ab83-29cc2de1368c" xlink:to="loc_us-gaap_TreasuryStockCommonMember_77f31c2c-e25f-4fb6-b663-e2890cb6cbbf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_726eb335-e1eb-46f1-8581-ea9efc79eeba" 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_fff3f79c-2790-4661-ab83-29cc2de1368c" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_726eb335-e1eb-46f1-8581-ea9efc79eeba" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_d3bd16f3-f771-4f65-9f74-8669eceab634" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_fff3f79c-2790-4661-ab83-29cc2de1368c" xlink:to="loc_us-gaap_NoncontrollingInterestMember_d3bd16f3-f771-4f65-9f74-8669eceab634" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#SummaryofSignificantAccountingPoliciesDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/SummaryofSignificantAccountingPoliciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SignificantAccountingPoliciesLineItems_f76de728-4862-4c70-b4a6-4990b8795f61" xlink:href="bdc-20231001.xsd#bdc_SignificantAccountingPoliciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_690b80c5-1e68-4a95-9cf5-bbebebb53b23" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bdc_SignificantAccountingPoliciesLineItems_f76de728-4862-4c70-b4a6-4990b8795f61" xlink:to="loc_us-gaap_NumberOfReportableSegments_690b80c5-1e68-4a95-9cf5-bbebebb53b23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_8fcc01e5-a1f7-4273-b39e-3e92a47d339c" 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_bdc_SignificantAccountingPoliciesLineItems_f76de728-4862-4c70-b4a6-4990b8795f61" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_8fcc01e5-a1f7-4273-b39e-3e92a47d339c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_53194a59-593d-43c4-b176-404ec2244165" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bdc_SignificantAccountingPoliciesLineItems_f76de728-4862-4c70-b4a6-4990b8795f61" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_53194a59-593d-43c4-b176-404ec2244165" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMinorityShareholders_2d3f6e8d-8cf4-40b2-88a7-91b256b3a381" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bdc_SignificantAccountingPoliciesLineItems_f76de728-4862-4c70-b4a6-4990b8795f61" xlink:to="loc_us-gaap_ProceedsFromMinorityShareholders_2d3f6e8d-8cf4-40b2-88a7-91b256b3a381" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeconsolidationGainOrLossAmount_929ad88f-22a0-4bbc-8446-a82825b95671" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeconsolidationGainOrLossAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bdc_SignificantAccountingPoliciesLineItems_f76de728-4862-4c70-b4a6-4990b8795f61" xlink:to="loc_us-gaap_DeconsolidationGainOrLossAmount_929ad88f-22a0-4bbc-8446-a82825b95671" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegistrationPaymentArrangementMaximumPotentialConsideration_7c7487c2-411e-4458-9617-89670a5120cf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RegistrationPaymentArrangementMaximumPotentialConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bdc_SignificantAccountingPoliciesLineItems_f76de728-4862-4c70-b4a6-4990b8795f61" xlink:to="loc_us-gaap_RegistrationPaymentArrangementMaximumPotentialConsideration_7c7487c2-411e-4458-9617-89670a5120cf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SignificantAccountingPoliciesTable_30645823-fc83-4e1c-a6d3-73d6758d7e78" xlink:href="bdc-20231001.xsd#bdc_SignificantAccountingPoliciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bdc_SignificantAccountingPoliciesLineItems_f76de728-4862-4c70-b4a6-4990b8795f61" xlink:to="loc_bdc_SignificantAccountingPoliciesTable_30645823-fc83-4e1c-a6d3-73d6758d7e78" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_e8f3a314-0323-4b7b-9d0b-170df34de041" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bdc_SignificantAccountingPoliciesTable_30645823-fc83-4e1c-a6d3-73d6758d7e78" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_e8f3a314-0323-4b7b-9d0b-170df34de041" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_e8f3a314-0323-4b7b-9d0b-170df34de041_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_e8f3a314-0323-4b7b-9d0b-170df34de041" xlink:to="loc_us-gaap_LossContingencyNatureDomain_e8f3a314-0323-4b7b-9d0b-170df34de041_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_301dcd94-bd37-44fd-9fb7-9d503daeaa24" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_e8f3a314-0323-4b7b-9d0b-170df34de041" xlink:to="loc_us-gaap_LossContingencyNatureDomain_301dcd94-bd37-44fd-9fb7-9d503daeaa24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_7af368ce-8a70-4988-a538-8406210730ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_301dcd94-bd37-44fd-9fb7-9d503daeaa24" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_7af368ce-8a70-4988-a538-8406210730ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SuretyBondMember_946b1a67-b3f7-4482-a75e-c6e1e2b308c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SuretyBondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_301dcd94-bd37-44fd-9fb7-9d503daeaa24" xlink:to="loc_us-gaap_SuretyBondMember_946b1a67-b3f7-4482-a75e-c6e1e2b308c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMember_7ca1c7f6-9937-46cc-a81b-a1b4a2e0c8e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_301dcd94-bd37-44fd-9fb7-9d503daeaa24" xlink:to="loc_us-gaap_GuaranteeObligationsMember_7ca1c7f6-9937-46cc-a81b-a1b4a2e0c8e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_fe12f5d9-c741-48c3-876e-45dc48342168" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bdc_SignificantAccountingPoliciesTable_30645823-fc83-4e1c-a6d3-73d6758d7e78" xlink:to="loc_srt_OwnershipAxis_fe12f5d9-c741-48c3-876e-45dc48342168" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_fe12f5d9-c741-48c3-876e-45dc48342168_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_fe12f5d9-c741-48c3-876e-45dc48342168" xlink:to="loc_srt_OwnershipDomain_fe12f5d9-c741-48c3-876e-45dc48342168_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_e6a51dd4-6125-4f2a-abd3-6ba0b83852f4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_fe12f5d9-c741-48c3-876e-45dc48342168" xlink:to="loc_srt_OwnershipDomain_e6a51dd4-6125-4f2a-abd3-6ba0b83852f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_HiteMember_2dea29b2-5c28-4118-ad23-aa2cc73d3bdb" xlink:href="bdc-20231001.xsd#bdc_HiteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_e6a51dd4-6125-4f2a-abd3-6ba0b83852f4" xlink:to="loc_bdc_HiteMember_2dea29b2-5c28-4118-ad23-aa2cc73d3bdb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/RevenuesMajorProductCategoryDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#RevenuesMajorProductCategoryDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/RevenuesMajorProductCategoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_ca70dc79-7c5f-490b-b7d4-186f7fab7f7b" 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_Revenues_3c05c32c-d019-453f-a27c-3c79145b4221" 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_DisaggregationOfRevenueLineItems_ca70dc79-7c5f-490b-b7d4-186f7fab7f7b" xlink:to="loc_us-gaap_Revenues_3c05c32c-d019-453f-a27c-3c79145b4221" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_874a3afd-d774-4069-a037-fe91ad31119b" 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_ca70dc79-7c5f-490b-b7d4-186f7fab7f7b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_874a3afd-d774-4069-a037-fe91ad31119b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_961244ba-c68e-4b23-8b09-fe05f7fd104e" 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_874a3afd-d774-4069-a037-fe91ad31119b" xlink:to="loc_srt_ProductOrServiceAxis_961244ba-c68e-4b23-8b09-fe05f7fd104e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_961244ba-c68e-4b23-8b09-fe05f7fd104e_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_961244ba-c68e-4b23-8b09-fe05f7fd104e" xlink:to="loc_srt_ProductsAndServicesDomain_961244ba-c68e-4b23-8b09-fe05f7fd104e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_05b8c7cf-606b-4466-abc6-844eb4fed64f" 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_961244ba-c68e-4b23-8b09-fe05f7fd104e" xlink:to="loc_srt_ProductsAndServicesDomain_05b8c7cf-606b-4466-abc6-844eb4fed64f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_BroadbandAnd5GMember_c3e7460e-2720-4946-830f-fa1fbab65c07" xlink:href="bdc-20231001.xsd#bdc_BroadbandAnd5GMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_05b8c7cf-606b-4466-abc6-844eb4fed64f" xlink:to="loc_bdc_BroadbandAnd5GMember_c3e7460e-2720-4946-830f-fa1fbab65c07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_IndustrialAutomationMember_8a20bb9e-720e-48c9-a445-8582849b4bf0" xlink:href="bdc-20231001.xsd#bdc_IndustrialAutomationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_05b8c7cf-606b-4466-abc6-844eb4fed64f" xlink:to="loc_bdc_IndustrialAutomationMember_8a20bb9e-720e-48c9-a445-8582849b4bf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SmartBuildingsMember_561687cb-7cd2-4af7-843f-49f3fa0b19f4" xlink:href="bdc-20231001.xsd#bdc_SmartBuildingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_05b8c7cf-606b-4466-abc6-844eb4fed64f" xlink:to="loc_bdc_SmartBuildingsMember_561687cb-7cd2-4af7-843f-49f3fa0b19f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ab18508a-0d36-41ae-a724-72d0ac7d4c8b" 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_874a3afd-d774-4069-a037-fe91ad31119b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ab18508a-0d36-41ae-a724-72d0ac7d4c8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ab18508a-0d36-41ae-a724-72d0ac7d4c8b_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_ab18508a-0d36-41ae-a724-72d0ac7d4c8b" xlink:to="loc_us-gaap_SegmentDomain_ab18508a-0d36-41ae-a724-72d0ac7d4c8b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_a5ddbdee-6d29-4ae6-bc22-7f2adcdb4743" 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_ab18508a-0d36-41ae-a724-72d0ac7d4c8b" xlink:to="loc_us-gaap_SegmentDomain_a5ddbdee-6d29-4ae6-bc22-7f2adcdb4743" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_EnterpriseSolutionsMember_e7829f06-dbe4-41ac-b092-999dc1ffe964" xlink:href="bdc-20231001.xsd#bdc_EnterpriseSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a5ddbdee-6d29-4ae6-bc22-7f2adcdb4743" xlink:to="loc_bdc_EnterpriseSolutionsMember_e7829f06-dbe4-41ac-b092-999dc1ffe964" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_IndustrialSolutionsMember_b2f3dd53-20c6-49b5-a3b6-01788a0858cd" xlink:href="bdc-20231001.xsd#bdc_IndustrialSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_a5ddbdee-6d29-4ae6-bc22-7f2adcdb4743" xlink:to="loc_bdc_IndustrialSolutionsMember_b2f3dd53-20c6-49b5-a3b6-01788a0858cd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/RevenuesLocationofCustomerDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#RevenuesLocationofCustomerDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/RevenuesLocationofCustomerDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_515589fd-df90-431a-96dc-61c6055a1b23" 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_Revenues_df5bdffa-495e-465f-b825-dc24d4818c04" 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_DisaggregationOfRevenueLineItems_515589fd-df90-431a-96dc-61c6055a1b23" xlink:to="loc_us-gaap_Revenues_df5bdffa-495e-465f-b825-dc24d4818c04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_8acf6d25-28dd-4f04-a1f8-c08949a3b1b3" 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_515589fd-df90-431a-96dc-61c6055a1b23" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_8acf6d25-28dd-4f04-a1f8-c08949a3b1b3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_341300e1-90d5-49fc-a153-a4d8211aaa68" 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_8acf6d25-28dd-4f04-a1f8-c08949a3b1b3" xlink:to="loc_srt_StatementGeographicalAxis_341300e1-90d5-49fc-a153-a4d8211aaa68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_341300e1-90d5-49fc-a153-a4d8211aaa68_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_341300e1-90d5-49fc-a153-a4d8211aaa68" xlink:to="loc_srt_SegmentGeographicalDomain_341300e1-90d5-49fc-a153-a4d8211aaa68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_dc96b186-b8c9-44cc-b084-e78f738e62b2" 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_341300e1-90d5-49fc-a153-a4d8211aaa68" xlink:to="loc_srt_SegmentGeographicalDomain_dc96b186-b8c9-44cc-b084-e78f738e62b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_a898b599-95dd-4e15-b136-6c316d49cc6f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_dc96b186-b8c9-44cc-b084-e78f738e62b2" xlink:to="loc_srt_AmericasMember_a898b599-95dd-4e15-b136-6c316d49cc6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_f3e2bc36-3e79-42e1-900d-f3855046c7d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_dc96b186-b8c9-44cc-b084-e78f738e62b2" xlink:to="loc_us-gaap_EMEAMember_f3e2bc36-3e79-42e1-900d-f3855046c7d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_00d4bb73-7aa2-44da-9a36-696bb04869f4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_dc96b186-b8c9-44cc-b084-e78f738e62b2" xlink:to="loc_srt_AsiaPacificMember_00d4bb73-7aa2-44da-9a36-696bb04869f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_8b9a107a-a33d-4f20-94f5-0bf30962fb37" 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_8acf6d25-28dd-4f04-a1f8-c08949a3b1b3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_8b9a107a-a33d-4f20-94f5-0bf30962fb37" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8b9a107a-a33d-4f20-94f5-0bf30962fb37_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_8b9a107a-a33d-4f20-94f5-0bf30962fb37" xlink:to="loc_us-gaap_SegmentDomain_8b9a107a-a33d-4f20-94f5-0bf30962fb37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_54497614-795f-45c6-9f75-b93f25d7fdf0" 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_8b9a107a-a33d-4f20-94f5-0bf30962fb37" xlink:to="loc_us-gaap_SegmentDomain_54497614-795f-45c6-9f75-b93f25d7fdf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_EnterpriseSolutionsMember_17eb44ea-57b9-4897-ba28-d8f48e7b070a" xlink:href="bdc-20231001.xsd#bdc_EnterpriseSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_54497614-795f-45c6-9f75-b93f25d7fdf0" xlink:to="loc_bdc_EnterpriseSolutionsMember_17eb44ea-57b9-4897-ba28-d8f48e7b070a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_IndustrialSolutionsMember_6d8935ec-3b66-45f9-9fa6-2596153a8fdf" xlink:href="bdc-20231001.xsd#bdc_IndustrialSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_54497614-795f-45c6-9f75-b93f25d7fdf0" xlink:to="loc_bdc_IndustrialSolutionsMember_6d8935ec-3b66-45f9-9fa6-2596153a8fdf" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/RevenuesAdditionalInformationDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#RevenuesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/RevenuesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_be0a85c7-960c-41cd-a139-89a53eaf6582" 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_ContractWithCustomerLiability_d7923d1e-bc2e-45e9-ae57-5f68d7ca68bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_be0a85c7-960c-41cd-a139-89a53eaf6582" xlink:to="loc_us-gaap_ContractWithCustomerLiability_d7923d1e-bc2e-45e9-ae57-5f68d7ca68bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_fa67df84-a5f7-481b-bb0b-f5d6044a4a30" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_be0a85c7-960c-41cd-a139-89a53eaf6582" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_fa67df84-a5f7-481b-bb0b-f5d6044a4a30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_e2cade64-2869-46ae-b5af-de6baa84908e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_be0a85c7-960c-41cd-a139-89a53eaf6582" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_e2cade64-2869-46ae-b5af-de6baa84908e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_70bdaab7-7f0d-4963-b525-21f23bf4c506" 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_be0a85c7-960c-41cd-a139-89a53eaf6582" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_70bdaab7-7f0d-4963-b525-21f23bf4c506" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_5270f6bf-5518-45d8-9e93-49450d186495" 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_70bdaab7-7f0d-4963-b525-21f23bf4c506" xlink:to="loc_srt_ProductOrServiceAxis_5270f6bf-5518-45d8-9e93-49450d186495" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_5270f6bf-5518-45d8-9e93-49450d186495_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_5270f6bf-5518-45d8-9e93-49450d186495" xlink:to="loc_srt_ProductsAndServicesDomain_5270f6bf-5518-45d8-9e93-49450d186495_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7559f1be-0c62-4772-add8-316147ed6b7d" 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_5270f6bf-5518-45d8-9e93-49450d186495" xlink:to="loc_srt_ProductsAndServicesDomain_7559f1be-0c62-4772-add8-316147ed6b7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_ServiceTypeWarrantiesMember_e577a9d3-c5f7-4a86-aeb2-a1f348d200ef" xlink:href="bdc-20231001.xsd#bdc_ServiceTypeWarrantiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7559f1be-0c62-4772-add8-316147ed6b7d" xlink:to="loc_bdc_ServiceTypeWarrantiesMember_e577a9d3-c5f7-4a86-aeb2-a1f348d200ef" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/AcquisitionsAdditionalInformationDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#AcquisitionsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/AcquisitionsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_a6fad92b-8ff0-401e-8405-be5fd55df729" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_59accd4c-f1ed-4ae1-a0ad-2b7f4b8b67b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationAcquiredReceivablesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a6fad92b-8ff0-401e-8405-be5fd55df729" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_59accd4c-f1ed-4ae1-a0ad-2b7f4b8b67b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_TaxBasisInAcquiredGoodwill_4eaa0e53-2c8a-4e6d-b78b-19aeb62b0603" xlink:href="bdc-20231001.xsd#bdc_TaxBasisInAcquiredGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a6fad92b-8ff0-401e-8405-be5fd55df729" xlink:to="loc_bdc_TaxBasisInAcquiredGoodwill_4eaa0e53-2c8a-4e6d-b78b-19aeb62b0603" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_03250a4f-6e28-4752-a17d-85600c30516e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a6fad92b-8ff0-401e-8405-be5fd55df729" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_03250a4f-6e28-4752-a17d-85600c30516e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_dfe8fef1-f070-49ba-911b-b5bcdccda609" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_03250a4f-6e28-4752-a17d-85600c30516e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_dfe8fef1-f070-49ba-911b-b5bcdccda609" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dfe8fef1-f070-49ba-911b-b5bcdccda609_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dfe8fef1-f070-49ba-911b-b5bcdccda609" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dfe8fef1-f070-49ba-911b-b5bcdccda609_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69f0578f-5ffc-4c37-8a7c-9ababae62edb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dfe8fef1-f070-49ba-911b-b5bcdccda609" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69f0578f-5ffc-4c37-8a7c-9ababae62edb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_BertholdSichertGmbHMember_45922b42-c667-4111-b961-5fa79a3b54d0" xlink:href="bdc-20231001.xsd#bdc_BertholdSichertGmbHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_69f0578f-5ffc-4c37-8a7c-9ababae62edb" xlink:to="loc_bdc_BertholdSichertGmbHMember_45922b42-c667-4111-b961-5fa79a3b54d0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/AcquisitionsScheduleofRecognizedIdentifiedAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_643f723e-28a3-4186-9e49-ef34a78481ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_643f723e-28a3-4186-9e49-ef34a78481ca" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_d823fc84-bfe5-4c8c-b2ab-71c77bd21613" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationAcquiredReceivablesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_d823fc84-bfe5-4c8c-b2ab-71c77bd21613" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_b6d42b61-6a3f-4789-98f4-170f3f51408c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_b6d42b61-6a3f-4789-98f4-170f3f51408c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_860ff4d2-892c-43e5-b698-1a8d8a2cbe87" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_860ff4d2-892c-43e5-b698-1a8d8a2cbe87" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_c003d369-b300-4aa1-82c7-2d30398a3791" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_c003d369-b300-4aa1-82c7-2d30398a3791" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_e7c7a25c-5127-4d77-a5a1-1bbe4bd4e321" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_e7c7a25c-5127-4d77-a5a1-1bbe4bd4e321" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_686c88d4-ce54-470b-8442-898366e7728f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:to="loc_us-gaap_Goodwill_686c88d4-ce54-470b-8442-898366e7728f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLongLivedAssets_54534897-740b-469f-94cd-1c0f6b0102fe" xlink:href="bdc-20231001.xsd#bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:to="loc_bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLongLivedAssets_54534897-740b-469f-94cd-1c0f6b0102fe" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsIncludingGoodwill_6d69b54d-a852-45e4-8746-49e3699b1a5c" xlink:href="bdc-20231001.xsd#bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_c983003b-eb02-4e31-845e-3872a1997737" xlink:to="loc_bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAssetsIncludingGoodwill_6d69b54d-a852-45e4-8746-49e3699b1a5c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_ad979225-ebff-41ac-9dd2-bc11724baee0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_643f723e-28a3-4186-9e49-ef34a78481ca" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_ad979225-ebff-41ac-9dd2-bc11724baee0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_1d1de437-c65a-451d-9cf0-e2b2302056f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_ad979225-ebff-41ac-9dd2-bc11724baee0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_1d1de437-c65a-451d-9cf0-e2b2302056f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedLiabilities_2a2ce567-bf62-49c4-9796-8ad864f4a531" xlink:href="bdc-20231001.xsd#bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_ad979225-ebff-41ac-9dd2-bc11724baee0" xlink:to="loc_bdc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedAccruedLiabilities_2a2ce567-bf62-49c4-9796-8ad864f4a531" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_b325887e-30b0-40f6-b0fb-cdc38ac3e361" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_ad979225-ebff-41ac-9dd2-bc11724baee0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_b325887e-30b0-40f6-b0fb-cdc38ac3e361" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_428abfde-2ef6-4618-b722-fbc57fb5be28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_ad979225-ebff-41ac-9dd2-bc11724baee0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_428abfde-2ef6-4618-b722-fbc57fb5be28" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_912640ee-38c2-4f0c-bb95-68c9b20580c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_643f723e-28a3-4186-9e49-ef34a78481ca" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_912640ee-38c2-4f0c-bb95-68c9b20580c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5dca35b3-1d6e-4a91-9360-e4154a1c49ab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_643f723e-28a3-4186-9e49-ef34a78481ca" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5dca35b3-1d6e-4a91-9360-e4154a1c49ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5566fd2e-a460-4c36-bdcb-dd7a03fddd14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_5dca35b3-1d6e-4a91-9360-e4154a1c49ab" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5566fd2e-a460-4c36-bdcb-dd7a03fddd14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5566fd2e-a460-4c36-bdcb-dd7a03fddd14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5566fd2e-a460-4c36-bdcb-dd7a03fddd14" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5566fd2e-a460-4c36-bdcb-dd7a03fddd14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3521979e-c5db-4b1f-a57b-c341b7cd41d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5566fd2e-a460-4c36-bdcb-dd7a03fddd14" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3521979e-c5db-4b1f-a57b-c341b7cd41d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_CloudRailGmbHMember_18a56478-5674-4eab-8016-fa14e831971f" xlink:href="bdc-20231001.xsd#bdc_CloudRailGmbHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3521979e-c5db-4b1f-a57b-c341b7cd41d9" xlink:to="loc_bdc_CloudRailGmbHMember_18a56478-5674-4eab-8016-fa14e831971f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_BertholdSichertGmbHMember_747629d0-8f90-4a2e-be27-50d133f1a300" xlink:href="bdc-20231001.xsd#bdc_BertholdSichertGmbHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3521979e-c5db-4b1f-a57b-c341b7cd41d9" xlink:to="loc_bdc_BertholdSichertGmbHMember_747629d0-8f90-4a2e-be27-50d133f1a300" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/AcquisitionsScheduleofAcquiredIntangibleAssetsDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#AcquisitionsScheduleofAcquiredIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/AcquisitionsScheduleofAcquiredIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_a1767e68-c576-46e9-afe8-2a1c9358f4a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_ebd86b40-400d-43f9-ac6a-f7dd75b3d6ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a1767e68-c576-46e9-afe8-2a1c9358f4a0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_ebd86b40-400d-43f9-ac6a-f7dd75b3d6ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_25ab2816-c885-40c3-a9a2-befce48a2eda" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a1767e68-c576-46e9-afe8-2a1c9358f4a0" xlink:to="loc_us-gaap_Goodwill_25ab2816-c885-40c3-a9a2-befce48a2eda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_cf0c3d5b-b06c-46e3-abc5-8d7ff7c8db27" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a1767e68-c576-46e9-afe8-2a1c9358f4a0" xlink:to="loc_us-gaap_IntangibleAssetsNetIncludingGoodwill_cf0c3d5b-b06c-46e3-abc5-8d7ff7c8db27" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_a2ba12a0-b250-49d3-9b54-cb262ea8481b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a1767e68-c576-46e9-afe8-2a1c9358f4a0" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_a2ba12a0-b250-49d3-9b54-cb262ea8481b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_41e736e7-8b9e-4f12-962a-b073d6417022" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a1767e68-c576-46e9-afe8-2a1c9358f4a0" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_41e736e7-8b9e-4f12-962a-b073d6417022" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7489f17e-86eb-4514-a495-07cb217dceda" 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_ScheduleOfBusinessAcquisitionsByAcquisitionTable_41e736e7-8b9e-4f12-962a-b073d6417022" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7489f17e-86eb-4514-a495-07cb217dceda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7489f17e-86eb-4514-a495-07cb217dceda_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_7489f17e-86eb-4514-a495-07cb217dceda" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7489f17e-86eb-4514-a495-07cb217dceda_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_22c867d1-fed4-4c94-beec-94e614bb1b53" 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_7489f17e-86eb-4514-a495-07cb217dceda" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_22c867d1-fed4-4c94-beec-94e614bb1b53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_ae8c6d83-f74f-4a9e-a619-da7d0a6de37b" 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_22c867d1-fed4-4c94-beec-94e614bb1b53" xlink:to="loc_us-gaap_CustomerRelationshipsMember_ae8c6d83-f74f-4a9e-a619-da7d0a6de37b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_9766b6c0-a0aa-4254-a45f-4c1d2d0a12cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_22c867d1-fed4-4c94-beec-94e614bb1b53" xlink:to="loc_us-gaap_TrademarksMember_9766b6c0-a0aa-4254-a45f-4c1d2d0a12cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SalesBacklogMember_88435470-af85-4508-85a9-b92de5720271" xlink:href="bdc-20231001.xsd#bdc_SalesBacklogMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_22c867d1-fed4-4c94-beec-94e614bb1b53" xlink:to="loc_bdc_SalesBacklogMember_88435470-af85-4508-85a9-b92de5720271" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_0be19122-e18d-44a9-90fa-53e2c214af25" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_41e736e7-8b9e-4f12-962a-b073d6417022" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_0be19122-e18d-44a9-90fa-53e2c214af25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0be19122-e18d-44a9-90fa-53e2c214af25_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0be19122-e18d-44a9-90fa-53e2c214af25" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_0be19122-e18d-44a9-90fa-53e2c214af25_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_04726df5-1008-462b-a64b-cb4ecca99c4c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_0be19122-e18d-44a9-90fa-53e2c214af25" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_04726df5-1008-462b-a64b-cb4ecca99c4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_BertholdSichertGmbHMember_eace9fba-7e8a-40a8-982c-a1c95476f948" xlink:href="bdc-20231001.xsd#bdc_BertholdSichertGmbHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_04726df5-1008-462b-a64b-cb4ecca99c4c" xlink:to="loc_bdc_BertholdSichertGmbHMember_eace9fba-7e8a-40a8-982c-a1c95476f948" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/DiscontinuedOperationsAdditionalInformationDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#DiscontinuedOperationsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/DiscontinuedOperationsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83448839-d7d3-4507-a708-85ddec7b65fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_466ca65b-163a-476d-a6e6-a2c873d5857e" 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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83448839-d7d3-4507-a708-85ddec7b65fd" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_466ca65b-163a-476d-a6e6-a2c873d5857e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ec027e26-f96f-4a2d-b32f-8c8969630f49" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83448839-d7d3-4507-a708-85ddec7b65fd" xlink:to="loc_us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax_ec027e26-f96f-4a2d-b32f-8c8969630f49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpenditureDiscontinuedOperations_4a2f3370-b8b8-49ba-b0e9-91ccf6f5f16f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalExpenditureDiscontinuedOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83448839-d7d3-4507-a708-85ddec7b65fd" xlink:to="loc_us-gaap_CapitalExpenditureDiscontinuedOperations_4a2f3370-b8b8-49ba-b0e9-91ccf6f5f16f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1cbf759f-c30a-4b87-9be5-6c9cabaefc38" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_83448839-d7d3-4507-a708-85ddec7b65fd" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1cbf759f-c30a-4b87-9be5-6c9cabaefc38" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_9b78182a-4a7d-4599-ba04-6588152eae9e" 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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1cbf759f-c30a-4b87-9be5-6c9cabaefc38" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_9b78182a-4a7d-4599-ba04-6588152eae9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_9b78182a-4a7d-4599-ba04-6588152eae9e_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_9b78182a-4a7d-4599-ba04-6588152eae9e" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_9b78182a-4a7d-4599-ba04-6588152eae9e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d1cbdc16-9980-4bc1-8b77-76dc6c27b41e" 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_9b78182a-4a7d-4599-ba04-6588152eae9e" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d1cbdc16-9980-4bc1-8b77-76dc6c27b41e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_TripwireMember_a0156372-a3a0-49b3-a32c-2112ab51b3de" xlink:href="bdc-20231001.xsd#bdc_TripwireMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_d1cbdc16-9980-4bc1-8b77-76dc6c27b41e" xlink:to="loc_bdc_TripwireMember_a0156372-a3a0-49b3-a32c-2112ab51b3de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_789e383f-c193-4bb4-b44a-3aa5b59023f4" 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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_1cbf759f-c30a-4b87-9be5-6c9cabaefc38" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_789e383f-c193-4bb4-b44a-3aa5b59023f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_789e383f-c193-4bb4-b44a-3aa5b59023f4_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_789e383f-c193-4bb4-b44a-3aa5b59023f4" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_789e383f-c193-4bb4-b44a-3aa5b59023f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_4e19529c-4c58-4602-aa58-a872cf4b3d5f" 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_789e383f-c193-4bb4-b44a-3aa5b59023f4" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_4e19529c-4c58-4602-aa58-a872cf4b3d5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_8372bf67-d1a2-4118-acbe-b7d071a1d7b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_4e19529c-4c58-4602-aa58-a872cf4b3d5f" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_8372bf67-d1a2-4118-acbe-b7d071a1d7b2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/DiscontinuedOperationsOperatingResultsoftheDisposalGroupDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#DiscontinuedOperationsOperatingResultsoftheDisposalGroupDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/DiscontinuedOperationsOperatingResultsoftheDisposalGroupDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_34d12887-6f58-477f-8308-9ebc1251f842" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_34d12887-6f58-477f-8308-9ebc1251f842" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_aa7eb10e-b344-4a75-a007-c541b0dfc497" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_aa7eb10e-b344-4a75-a007-c541b0dfc497" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss_43115651-dd83-4ecd-9697-67b801c8596d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss_43115651-dd83-4ecd-9697-67b801c8596d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_7f7ab333-959f-44e6-a5e1-f2f7aa19b788" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_7f7ab333-959f-44e6-a5e1-f2f7aa19b788" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_DisposalGroupIncludingDiscontinuedOperationResearchAndDevelopmentExpense_39e5716d-7794-4701-b6e2-43b7da5ef8cc" xlink:href="bdc-20231001.xsd#bdc_DisposalGroupIncludingDiscontinuedOperationResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:to="loc_bdc_DisposalGroupIncludingDiscontinuedOperationResearchAndDevelopmentExpense_39e5716d-7794-4701-b6e2-43b7da5ef8cc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_54ce7026-5c45-4297-afdc-9cf0f38a520a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization_54ce7026-5c45-4297-afdc-9cf0f38a520a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_d11f4514-5194-4e6c-b8ac-c8e4b9ec4155" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_d11f4514-5194-4e6c-b8ac-c8e4b9ec4155" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_26fe70d0-b2a4-4f4b-bda2-ea8dc8cf7df7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_1bd2e725-9732-4a8b-a1e9-f7f8fa017f35" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_26fe70d0-b2a4-4f4b-bda2-ea8dc8cf7df7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_01e94043-5690-4e98-9d38-8570bb584ccb" 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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_26fe70d0-b2a4-4f4b-bda2-ea8dc8cf7df7" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_01e94043-5690-4e98-9d38-8570bb584ccb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_01e94043-5690-4e98-9d38-8570bb584ccb_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_01e94043-5690-4e98-9d38-8570bb584ccb" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_01e94043-5690-4e98-9d38-8570bb584ccb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_1ce4266c-3d1e-4571-aecf-bf48973f2033" 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_01e94043-5690-4e98-9d38-8570bb584ccb" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_1ce4266c-3d1e-4571-aecf-bf48973f2033" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_TripwireMember_177d8592-d6e7-4596-be61-3761c39e9f03" xlink:href="bdc-20231001.xsd#bdc_TripwireMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_1ce4266c-3d1e-4571-aecf-bf48973f2033" xlink:to="loc_bdc_TripwireMember_177d8592-d6e7-4596-be61-3761c39e9f03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_45fb0455-360b-48cf-88d1-bcfb02d14609" 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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_26fe70d0-b2a4-4f4b-bda2-ea8dc8cf7df7" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_45fb0455-360b-48cf-88d1-bcfb02d14609" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_45fb0455-360b-48cf-88d1-bcfb02d14609_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_45fb0455-360b-48cf-88d1-bcfb02d14609" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_45fb0455-360b-48cf-88d1-bcfb02d14609_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_d2ddc8e3-2794-4751-b91c-489cd76a2963" 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_45fb0455-360b-48cf-88d1-bcfb02d14609" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_d2ddc8e3-2794-4751-b91c-489cd76a2963" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_c7eaf01d-c927-41a5-9081-57b5ce7feb2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DiscontinuedOperationsHeldforsaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_d2ddc8e3-2794-4751-b91c-489cd76a2963" xlink:to="loc_us-gaap_DiscontinuedOperationsHeldforsaleMember_c7eaf01d-c927-41a5-9081-57b5ce7feb2a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/ReportableSegmentsOperatingSegmentInformationDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#ReportableSegmentsOperatingSegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/ReportableSegmentsOperatingSegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_b351c35b-49ed-42f2-a5f8-f2834c931de2" 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_Revenues_a425cdd8-7c03-424b-9e07-60ac68360b8a" 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_SegmentReportingInformationLineItems_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_us-gaap_Revenues_a425cdd8-7c03-424b-9e07-60ac68360b8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_EarningsBeforeInterestTaxesDepreciationAndAmortization_97b2ed64-dcef-47d9-8be7-87873b893eba" xlink:href="bdc-20231001.xsd#bdc_EarningsBeforeInterestTaxesDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_bdc_EarningsBeforeInterestTaxesDepreciationAndAmortization_97b2ed64-dcef-47d9-8be7-87873b893eba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_0e51c409-0ef6-431a-9270-633640ff1fc6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_us-gaap_Depreciation_0e51c409-0ef6-431a-9270-633640ff1fc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_9d5f1e9e-0bf7-4554-9c6e-4a42ae15f0ab" 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_SegmentReportingInformationLineItems_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_9d5f1e9e-0bf7-4554-9c6e-4a42ae15f0ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_10915498-ff33-4049-9636-50bcbdaab444" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_10915498-ff33-4049-9636-50bcbdaab444" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_428d12e2-b50b-41c9-b6d2-fd98ba96c91f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_us-gaap_RestructuringCharges_428d12e2-b50b-41c9-b6d2-fd98ba96c91f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_PurchaseAccountingEffectsAcquisitions_69ca47e3-747e-43d9-8276-ae6aacbf0089" xlink:href="bdc-20231001.xsd#bdc_PurchaseAccountingEffectsAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_bdc_PurchaseAccountingEffectsAcquisitions_69ca47e3-747e-43d9-8276-ae6aacbf0089" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_117f74ae-9539-4a68-91dd-0ffae3ee2f95" 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_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_us-gaap_Assets_117f74ae-9539-4a68-91dd-0ffae3ee2f95" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c73fd75d-3a15-4c4d-8a69-1017081daaea" 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_b351c35b-49ed-42f2-a5f8-f2834c931de2" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_c73fd75d-3a15-4c4d-8a69-1017081daaea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_d5e9aeca-a898-4efb-8055-92aa72045b5b" 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_c73fd75d-3a15-4c4d-8a69-1017081daaea" xlink:to="loc_srt_ConsolidationItemsAxis_d5e9aeca-a898-4efb-8055-92aa72045b5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_d5e9aeca-a898-4efb-8055-92aa72045b5b_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_d5e9aeca-a898-4efb-8055-92aa72045b5b" xlink:to="loc_srt_ConsolidationItemsDomain_d5e9aeca-a898-4efb-8055-92aa72045b5b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_8bdef678-40b4-4040-a5b5-2fda18e7133e" 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_d5e9aeca-a898-4efb-8055-92aa72045b5b" xlink:to="loc_srt_ConsolidationItemsDomain_8bdef678-40b4-4040-a5b5-2fda18e7133e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_09f87674-944a-493a-b09a-77820ebea166" 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_8bdef678-40b4-4040-a5b5-2fda18e7133e" xlink:to="loc_us-gaap_OperatingSegmentsMember_09f87674-944a-493a-b09a-77820ebea166" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_b8878fb8-1a22-4b0d-b657-4791453ce0e2" 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_c73fd75d-3a15-4c4d-8a69-1017081daaea" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_b8878fb8-1a22-4b0d-b657-4791453ce0e2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b8878fb8-1a22-4b0d-b657-4791453ce0e2_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_b8878fb8-1a22-4b0d-b657-4791453ce0e2" xlink:to="loc_us-gaap_SegmentDomain_b8878fb8-1a22-4b0d-b657-4791453ce0e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5234a152-8114-4104-af7e-39367438cd35" 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_b8878fb8-1a22-4b0d-b657-4791453ce0e2" xlink:to="loc_us-gaap_SegmentDomain_5234a152-8114-4104-af7e-39367438cd35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_EnterpriseSolutionsMember_63c99f78-2915-41b5-81c3-60d22daeead4" xlink:href="bdc-20231001.xsd#bdc_EnterpriseSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_5234a152-8114-4104-af7e-39367438cd35" xlink:to="loc_bdc_EnterpriseSolutionsMember_63c99f78-2915-41b5-81c3-60d22daeead4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_IndustrialSolutionsMember_e49a4485-d3a2-436e-9d53-ec883a0bcad6" xlink:href="bdc-20231001.xsd#bdc_IndustrialSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_5234a152-8114-4104-af7e-39367438cd35" xlink:to="loc_bdc_IndustrialSolutionsMember_e49a4485-d3a2-436e-9d53-ec883a0bcad6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_429d01e2-91da-46c7-b5a6-e38ee86e89b9" 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_ScheduleOfSegmentReportingInformationBySegmentTable_c73fd75d-3a15-4c4d-8a69-1017081daaea" xlink:to="loc_srt_ProductOrServiceAxis_429d01e2-91da-46c7-b5a6-e38ee86e89b9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_429d01e2-91da-46c7-b5a6-e38ee86e89b9_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_429d01e2-91da-46c7-b5a6-e38ee86e89b9" xlink:to="loc_srt_ProductsAndServicesDomain_429d01e2-91da-46c7-b5a6-e38ee86e89b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_561f244a-d0a7-4614-9633-f46b8966d94a" 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_429d01e2-91da-46c7-b5a6-e38ee86e89b9" xlink:to="loc_srt_ProductsAndServicesDomain_561f244a-d0a7-4614-9633-f46b8966d94a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SegmentRevenueMember_31a2a4c7-3e67-47bd-bbed-80ab73e959c8" xlink:href="bdc-20231001.xsd#bdc_SegmentRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_561f244a-d0a7-4614-9633-f46b8966d94a" xlink:to="loc_bdc_SegmentRevenueMember_31a2a4c7-3e67-47bd-bbed-80ab73e959c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b32d5b0f-71b8-49c1-b885-0aec24cbab44" 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_ScheduleOfSegmentReportingInformationBySegmentTable_c73fd75d-3a15-4c4d-8a69-1017081daaea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b32d5b0f-71b8-49c1-b885-0aec24cbab44" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b32d5b0f-71b8-49c1-b885-0aec24cbab44_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_b32d5b0f-71b8-49c1-b885-0aec24cbab44" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b32d5b0f-71b8-49c1-b885-0aec24cbab44_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5b6e441c-2307-45d5-9300-78e6841132f9" 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_b32d5b0f-71b8-49c1-b885-0aec24cbab44" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5b6e441c-2307-45d5-9300-78e6841132f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_7cb587e9-73d1-4582-93c9-b3138cdeb668" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5b6e441c-2307-45d5-9300-78e6841132f9" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_7cb587e9-73d1-4582-93c9-b3138cdeb668" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/ReportableSegmentsReconciliationofTotalReportableSegmentsRevenuesandEBITDAtoConsolidatedRevenuesandConsolidatedIncomeBeforeTaxesDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#ReportableSegmentsReconciliationofTotalReportableSegmentsRevenuesandEBITDAtoConsolidatedRevenuesandConsolidatedIncomeBeforeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/ReportableSegmentsReconciliationofTotalReportableSegmentsRevenuesandEBITDAtoConsolidatedRevenuesandConsolidatedIncomeBeforeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_e0a07c0b-a53c-4cc2-b2e6-caedec2d37b9" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_Revenues_e0a07c0b-a53c-4cc2-b2e6-caedec2d37b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_EarningsBeforeInterestTaxesDepreciationAndAmortization_02db6889-71b6-46f2-9e92-1c93032db60b" xlink:href="bdc-20231001.xsd#bdc_EarningsBeforeInterestTaxesDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_bdc_EarningsBeforeInterestTaxesDepreciationAndAmortization_02db6889-71b6-46f2-9e92-1c93032db60b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_b2d6cdf3-1db0-4aaa-be16-5d912da827e3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_Depreciation_b2d6cdf3-1db0-4aaa-be16-5d912da827e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_1631f3e8-e2f5-4492-97f2-e212d26b3d51" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_1631f3e8-e2f5-4492-97f2-e212d26b3d51" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_b4cc07b9-2df5-4a34-b7c3-77b682829699" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_RestructuringCharges_b4cc07b9-2df5-4a34-b7c3-77b682829699" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_00bbae9c-40ae-4587-babe-3ab97263465b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_00bbae9c-40ae-4587-babe-3ab97263465b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_PurchaseAccountingEffectsAcquisitions_449f5995-f75d-4266-aec3-19dd29d8b133" xlink:href="bdc-20231001.xsd#bdc_PurchaseAccountingEffectsAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_bdc_PurchaseAccountingEffectsAcquisitions_449f5995-f75d-4266-aec3-19dd29d8b133" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_051a537f-2124-4bc6-8d75-bc5f59960e30" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_OperatingIncomeLoss_051a537f-2124-4bc6-8d75-bc5f59960e30" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_eb36dfa2-2e76-42f1-b184-d15619696a97" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_eb36dfa2-2e76-42f1-b184-d15619696a97" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_eba21b4b-5684-446b-b292-e258cb8c4204" 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_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_eba21b4b-5684-446b-b292-e258cb8c4204" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_PensionCostsNonoperating_95e088c4-da3b-4b5d-8d8e-624725ce4aab" xlink:href="bdc-20231001.xsd#bdc_PensionCostsNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_bdc_PensionCostsNonoperating_95e088c4-da3b-4b5d-8d8e-624725ce4aab" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_ba4a25a1-fc82-4166-b3b7-c5cf6ce1b0b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_ba4a25a1-fc82-4166-b3b7-c5cf6ce1b0b7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_f9f2a1e6-eecd-4880-8ade-8715d835cd48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_7e59021e-db20-44f3-9733-d19f2daa8d99" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_f9f2a1e6-eecd-4880-8ade-8715d835cd48" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_be4aae0d-7275-42ad-99e6-b2908bc98e4c" 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_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_f9f2a1e6-eecd-4880-8ade-8715d835cd48" xlink:to="loc_srt_ConsolidationItemsAxis_be4aae0d-7275-42ad-99e6-b2908bc98e4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_be4aae0d-7275-42ad-99e6-b2908bc98e4c_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_be4aae0d-7275-42ad-99e6-b2908bc98e4c" xlink:to="loc_srt_ConsolidationItemsDomain_be4aae0d-7275-42ad-99e6-b2908bc98e4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_5f8939a6-0ff0-4993-8852-f1da8225c441" 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_be4aae0d-7275-42ad-99e6-b2908bc98e4c" xlink:to="loc_srt_ConsolidationItemsDomain_5f8939a6-0ff0-4993-8852-f1da8225c441" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_d2be0af0-4f79-4ed9-8e48-1712a38dadbb" 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_5f8939a6-0ff0-4993-8852-f1da8225c441" xlink:to="loc_us-gaap_OperatingSegmentsMember_d2be0af0-4f79-4ed9-8e48-1712a38dadbb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_82fae13c-aa80-4b57-be65-934c556be71b" 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_5f8939a6-0ff0-4993-8852-f1da8225c441" xlink:to="loc_us-gaap_IntersegmentEliminationMember_82fae13c-aa80-4b57-be65-934c556be71b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_4dfe5053-7be5-433a-ab33-2e5bba4f84c2" 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_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_f9f2a1e6-eecd-4880-8ade-8715d835cd48" xlink:to="loc_srt_ProductOrServiceAxis_4dfe5053-7be5-433a-ab33-2e5bba4f84c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_4dfe5053-7be5-433a-ab33-2e5bba4f84c2_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_4dfe5053-7be5-433a-ab33-2e5bba4f84c2" xlink:to="loc_srt_ProductsAndServicesDomain_4dfe5053-7be5-433a-ab33-2e5bba4f84c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_a6e7a8f0-a2f8-461f-8c03-9287521559fb" 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_4dfe5053-7be5-433a-ab33-2e5bba4f84c2" xlink:to="loc_srt_ProductsAndServicesDomain_a6e7a8f0-a2f8-461f-8c03-9287521559fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SegmentRevenueMember_419cd40a-2808-4420-83a1-b36f6d7a877e" xlink:href="bdc-20231001.xsd#bdc_SegmentRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a6e7a8f0-a2f8-461f-8c03-9287521559fb" xlink:to="loc_bdc_SegmentRevenueMember_419cd40a-2808-4420-83a1-b36f6d7a877e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/LeasesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_0958b45e-606e-4ff7-a84f-8ce2538e21b4" 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_bdc_LesseeOperatingAndFinanceLeaseTermOfContract_2564be67-b85a-4f0f-85b9-5014f0263337" xlink:href="bdc-20231001.xsd#bdc_LesseeOperatingAndFinanceLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0958b45e-606e-4ff7-a84f-8ce2538e21b4" xlink:to="loc_bdc_LesseeOperatingAndFinanceLeaseTermOfContract_2564be67-b85a-4f0f-85b9-5014f0263337" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeasePayment_ac4d62d1-34f2-4e65-8435-233e9e007587" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableLeasePayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0958b45e-606e-4ff7-a84f-8ce2538e21b4" xlink:to="loc_us-gaap_VariableLeasePayment_ac4d62d1-34f2-4e65-8435-233e9e007587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_LeasesFixedPaymentsRemaining_0198fcd7-c1b4-4d11-bee4-9fd8a2585f62" xlink:href="bdc-20231001.xsd#bdc_LeasesFixedPaymentsRemaining"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0958b45e-606e-4ff7-a84f-8ce2538e21b4" xlink:to="loc_bdc_LeasesFixedPaymentsRemaining_0198fcd7-c1b4-4d11-bee4-9fd8a2585f62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_NumberOfLeasesDefaultedOn_29fda0e0-f2bc-4e93-8a30-7f29c04bad33" xlink:href="bdc-20231001.xsd#bdc_NumberOfLeasesDefaultedOn"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0958b45e-606e-4ff7-a84f-8ce2538e21b4" xlink:to="loc_bdc_NumberOfLeasesDefaultedOn_29fda0e0-f2bc-4e93-8a30-7f29c04bad33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseResidualValueOfLeasedAsset_fe6b6e94-2d1d-40f6-82b0-459fce64497b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLeaseResidualValueOfLeasedAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_0958b45e-606e-4ff7-a84f-8ce2538e21b4" xlink:to="loc_us-gaap_OperatingLeaseResidualValueOfLeasedAsset_fe6b6e94-2d1d-40f6-82b0-459fce64497b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_1e409d81-f621-49a6-81ea-5bc5b3e484d1" 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_0958b45e-606e-4ff7-a84f-8ce2538e21b4" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_1e409d81-f621-49a6-81ea-5bc5b3e484d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_8aaa6f83-9184-4a75-bbad-f1171f4e9b87" 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_LesseeLeaseDescriptionTable_1e409d81-f621-49a6-81ea-5bc5b3e484d1" xlink:to="loc_srt_RangeAxis_8aaa6f83-9184-4a75-bbad-f1171f4e9b87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8aaa6f83-9184-4a75-bbad-f1171f4e9b87_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_8aaa6f83-9184-4a75-bbad-f1171f4e9b87" xlink:to="loc_srt_RangeMember_8aaa6f83-9184-4a75-bbad-f1171f4e9b87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d52547da-8e37-4eb0-bb5a-d42a0936dbd4" 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_8aaa6f83-9184-4a75-bbad-f1171f4e9b87" xlink:to="loc_srt_RangeMember_d52547da-8e37-4eb0-bb5a-d42a0936dbd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_22e7d36c-e712-41d3-94b5-7912cc253db2" 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_d52547da-8e37-4eb0-bb5a-d42a0936dbd4" xlink:to="loc_srt_MinimumMember_22e7d36c-e712-41d3-94b5-7912cc253db2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f1b7b829-078a-4a5e-ba13-490e5e92e839" 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_d52547da-8e37-4eb0-bb5a-d42a0936dbd4" xlink:to="loc_srt_MaximumMember_f1b7b829-078a-4a5e-ba13-490e5e92e839" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/SeveranceRestructuringandAcquisitionIntegrationActivitiesAdditionalInformationDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#SeveranceRestructuringandAcquisitionIntegrationActivitiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/SeveranceRestructuringandAcquisitionIntegrationActivitiesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_b52ac1ec-290c-4b56-87cb-fa7e7a9b2be9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_e82f867a-eb52-4202-92b0-dca9e2875f07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b52ac1ec-290c-4b56-87cb-fa7e7a9b2be9" xlink:to="loc_us-gaap_RestructuringCharges_e82f867a-eb52-4202-92b0-dca9e2875f07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_RestructuringAndIntegrationCostPayablePeriod_addb8556-9dd9-45ac-bb23-824c658e531e" xlink:href="bdc-20231001.xsd#bdc_RestructuringAndIntegrationCostPayablePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b52ac1ec-290c-4b56-87cb-fa7e7a9b2be9" xlink:to="loc_bdc_RestructuringAndIntegrationCostPayablePeriod_addb8556-9dd9-45ac-bb23-824c658e531e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f6b8bcf-021c-4e23-8c13-13f06b773dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_b52ac1ec-290c-4b56-87cb-fa7e7a9b2be9" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f6b8bcf-021c-4e23-8c13-13f06b773dfb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_80b65a29-af90-4b99-9cb2-ff9577317f43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3f6b8bcf-021c-4e23-8c13-13f06b773dfb" xlink:to="loc_us-gaap_RestructuringPlanAxis_80b65a29-af90-4b99-9cb2-ff9577317f43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_80b65a29-af90-4b99-9cb2-ff9577317f43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_80b65a29-af90-4b99-9cb2-ff9577317f43" xlink:to="loc_us-gaap_RestructuringPlanDomain_80b65a29-af90-4b99-9cb2-ff9577317f43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_62a09389-de3b-4d7e-8cc2-15cf4d233a07" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_80b65a29-af90-4b99-9cb2-ff9577317f43" xlink:to="loc_us-gaap_RestructuringPlanDomain_62a09389-de3b-4d7e-8cc2-15cf4d233a07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_AcquisitionIntegrationProgramMember_afab1382-ba92-453e-b723-279538dba900" xlink:href="bdc-20231001.xsd#bdc_AcquisitionIntegrationProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_62a09389-de3b-4d7e-8cc2-15cf4d233a07" xlink:to="loc_bdc_AcquisitionIntegrationProgramMember_afab1382-ba92-453e-b723-279538dba900" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_be0d2df5-c64f-4038-ae9c-7f031392b12e" 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_ScheduleOfRestructuringAndRelatedCostsTable_3f6b8bcf-021c-4e23-8c13-13f06b773dfb" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_be0d2df5-c64f-4038-ae9c-7f031392b12e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_be0d2df5-c64f-4038-ae9c-7f031392b12e_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_be0d2df5-c64f-4038-ae9c-7f031392b12e" xlink:to="loc_us-gaap_SegmentDomain_be0d2df5-c64f-4038-ae9c-7f031392b12e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_109f4f75-11ca-4bcb-abea-cbd3878014b6" 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_be0d2df5-c64f-4038-ae9c-7f031392b12e" xlink:to="loc_us-gaap_SegmentDomain_109f4f75-11ca-4bcb-abea-cbd3878014b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_EnterpriseSolutionsMember_ff254ee6-0202-4578-852c-9d8e6add2dbf" xlink:href="bdc-20231001.xsd#bdc_EnterpriseSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_109f4f75-11ca-4bcb-abea-cbd3878014b6" xlink:to="loc_bdc_EnterpriseSolutionsMember_ff254ee6-0202-4578-852c-9d8e6add2dbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_IndustrialAutomationSolutionsMember_56d1d662-4c9c-467f-ba91-c9e16e8067dd" xlink:href="bdc-20231001.xsd#bdc_IndustrialAutomationSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_109f4f75-11ca-4bcb-abea-cbd3878014b6" xlink:to="loc_bdc_IndustrialAutomationSolutionsMember_56d1d662-4c9c-467f-ba91-c9e16e8067dd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/SeveranceRestructuringandAcquisitionIntegrationActivitiesCostsofVariousProgramsDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#SeveranceRestructuringandAcquisitionIntegrationActivitiesCostsofVariousProgramsDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/SeveranceRestructuringandAcquisitionIntegrationActivitiesCostsofVariousProgramsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_5dd0ce6b-47bb-40e9-bd72-bd785b2e6918" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_a5526b56-62ae-42a1-b456-ecc6ecb4030a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_5dd0ce6b-47bb-40e9-bd72-bd785b2e6918" xlink:to="loc_us-gaap_RestructuringCharges_a5526b56-62ae-42a1-b456-ecc6ecb4030a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7596cb2e-4c76-451d-8e18-ac38f6e3c356" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_5dd0ce6b-47bb-40e9-bd72-bd785b2e6918" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_7596cb2e-4c76-451d-8e18-ac38f6e3c356" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_7b8d1158-0c1f-43d3-a988-b53af840369d" 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_ScheduleOfRestructuringAndRelatedCostsTable_7596cb2e-4c76-451d-8e18-ac38f6e3c356" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_7b8d1158-0c1f-43d3-a988-b53af840369d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_7b8d1158-0c1f-43d3-a988-b53af840369d_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_7b8d1158-0c1f-43d3-a988-b53af840369d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_7b8d1158-0c1f-43d3-a988-b53af840369d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_85e1cde5-3c71-4420-a2cb-58b7ff0a1c25" 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_7b8d1158-0c1f-43d3-a988-b53af840369d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_85e1cde5-3c71-4420-a2cb-58b7ff0a1c25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_3e4ae4c9-943c-4c0f-9b10-813ccdea118b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_85e1cde5-3c71-4420-a2cb-58b7ff0a1c25" xlink:to="loc_us-gaap_CostOfSalesMember_3e4ae4c9-943c-4c0f-9b10-813ccdea118b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_1ac8f430-102d-4674-8d95-fcbebf7ccdd2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_85e1cde5-3c71-4420-a2cb-58b7ff0a1c25" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_1ac8f430-102d-4674-8d95-fcbebf7ccdd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_05b06bd4-eb38-4490-8fe6-1053dcdcee6c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_85e1cde5-3c71-4420-a2cb-58b7ff0a1c25" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_05b06bd4-eb38-4490-8fe6-1053dcdcee6c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/LongTermDebtandOtherBorrowingArrangementsCarryingValuesofLongTermDebtandOtherBorrowingArrangementsDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#LongTermDebtandOtherBorrowingArrangementsCarryingValuesofLongTermDebtandOtherBorrowingArrangementsDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/LongTermDebtandOtherBorrowingArrangementsCarryingValuesofLongTermDebtandOtherBorrowingArrangementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_351af53c-bd98-4e13-9181-adb50874ea5d" 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_LineOfCredit_358418fd-bea9-49d2-bf13-1b64d2381538" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_351af53c-bd98-4e13-9181-adb50874ea5d" xlink:to="loc_us-gaap_LineOfCredit_358418fd-bea9-49d2-bf13-1b64d2381538" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_5e3acbb8-3f33-42e5-83b0-4e5884857919" 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_DebtInstrumentLineItems_351af53c-bd98-4e13-9181-adb50874ea5d" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_5e3acbb8-3f33-42e5-83b0-4e5884857919" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedLongTermDebt_42eb4416-e6f5-4633-9b2d-1b0b0b6e0cce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubordinatedLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_351af53c-bd98-4e13-9181-adb50874ea5d" xlink:to="loc_us-gaap_SubordinatedLongTermDebt_42eb4416-e6f5-4633-9b2d-1b0b0b6e0cce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_f5de0dc8-ad24-438d-8f95-659808304693" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_351af53c-bd98-4e13-9181-adb50874ea5d" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_f5de0dc8-ad24-438d-8f95-659808304693" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_2c39f156-0ad3-4780-bea7-a11469f131e9" 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_DebtInstrumentLineItems_351af53c-bd98-4e13-9181-adb50874ea5d" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_2c39f156-0ad3-4780-bea7-a11469f131e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_5f4f4886-a49e-4c49-b161-41793f33676f" 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_351af53c-bd98-4e13-9181-adb50874ea5d" xlink:to="loc_us-gaap_DebtInstrumentTable_5f4f4886-a49e-4c49-b161-41793f33676f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_48d79d69-0171-4908-a37c-f6bef958ca9d" 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_5f4f4886-a49e-4c49-b161-41793f33676f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_48d79d69-0171-4908-a37c-f6bef958ca9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_48d79d69-0171-4908-a37c-f6bef958ca9d_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_48d79d69-0171-4908-a37c-f6bef958ca9d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_48d79d69-0171-4908-a37c-f6bef958ca9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6f6cf29f-7942-4815-9c32-fac39c5e72a5" 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_48d79d69-0171-4908-a37c-f6bef958ca9d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6f6cf29f-7942-4815-9c32-fac39c5e72a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorSubordinatedNotesMember_70bdfa87-992e-4bca-b911-7b16fb0fd340" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_6f6cf29f-7942-4815-9c32-fac39c5e72a5" xlink:to="loc_us-gaap_SeniorSubordinatedNotesMember_70bdfa87-992e-4bca-b911-7b16fb0fd340" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e475b493-9e2c-4eb5-8b49-6c66b1320e5a" 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_5f4f4886-a49e-4c49-b161-41793f33676f" xlink:to="loc_us-gaap_DebtInstrumentAxis_e475b493-9e2c-4eb5-8b49-6c66b1320e5a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e475b493-9e2c-4eb5-8b49-6c66b1320e5a_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_e475b493-9e2c-4eb5-8b49-6c66b1320e5a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e475b493-9e2c-4eb5-8b49-6c66b1320e5a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_9eb1fa03-a457-4266-9d3b-f8401ef2d469" 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_e475b493-9e2c-4eb5-8b49-6c66b1320e5a" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_9eb1fa03-a457-4266-9d3b-f8401ef2d469" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_RevolvingCreditFacilityMatureTwoThousandTwentySixMember_604ce73b-f02c-40d8-9585-63965a9baac2" xlink:href="bdc-20231001.xsd#bdc_RevolvingCreditFacilityMatureTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9eb1fa03-a457-4266-9d3b-f8401ef2d469" xlink:to="loc_bdc_RevolvingCreditFacilityMatureTwoThousandTwentySixMember_604ce73b-f02c-40d8-9585-63965a9baac2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_A3.375SeniorSubordinatedNotesDue2027Member_bd4b6d81-4bdf-4916-994b-edea20df73f8" xlink:href="bdc-20231001.xsd#bdc_A3.375SeniorSubordinatedNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9eb1fa03-a457-4266-9d3b-f8401ef2d469" xlink:to="loc_bdc_A3.375SeniorSubordinatedNotesDue2027Member_bd4b6d81-4bdf-4916-994b-edea20df73f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_A3.875SeniorSubordinatedNotesDue2028Member_3a11b02b-d419-4d63-8a5a-41e224470db9" xlink:href="bdc-20231001.xsd#bdc_A3.875SeniorSubordinatedNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9eb1fa03-a457-4266-9d3b-f8401ef2d469" xlink:to="loc_bdc_A3.875SeniorSubordinatedNotesDue2028Member_3a11b02b-d419-4d63-8a5a-41e224470db9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_A3375SeniorSubordinatedNotesDue2031Member_ed7d32a3-e30c-47b3-bf93-d462f351e28a" xlink:href="bdc-20231001.xsd#bdc_A3375SeniorSubordinatedNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9eb1fa03-a457-4266-9d3b-f8401ef2d469" xlink:to="loc_bdc_A3375SeniorSubordinatedNotesDue2031Member_ed7d32a3-e30c-47b3-bf93-d462f351e28a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/LongTermDebtandOtherBorrowingArrangementsAdditionalInformationDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#LongTermDebtandOtherBorrowingArrangementsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/LongTermDebtandOtherBorrowingArrangementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" 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_LineOfCreditFacilityMaximumBorrowingCapacity_d4d7ef57-7588-41c6-9528-8cae2acf4625" 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_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_d4d7ef57-7588-41c6-9528-8cae2acf4625" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a28317d6-bc0a-4185-86a2-9891a33bfe63" 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_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_a28317d6-bc0a-4185-86a2-9891a33bfe63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_51f06fdb-69d8-4237-8369-521f81ae9caa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_51f06fdb-69d8-4237-8369-521f81ae9caa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SeniorSecuredCreditFacilityRestrictiveCovenantsFixedChargeCoverageRatioMinimumThreshold_61e68f98-f2d2-4b4b-9c0d-daee02600556" xlink:href="bdc-20231001.xsd#bdc_SeniorSecuredCreditFacilityRestrictiveCovenantsFixedChargeCoverageRatioMinimumThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_bdc_SeniorSecuredCreditFacilityRestrictiveCovenantsFixedChargeCoverageRatioMinimumThreshold_61e68f98-f2d2-4b4b-9c0d-daee02600556" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_ce1460cd-6aec-40df-adfe-4a29a6049787" 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_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_ce1460cd-6aec-40df-adfe-4a29a6049787" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_aa3a1dba-c70c-4cd0-a127-5ee4f2a5f716" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_LineOfCredit_aa3a1dba-c70c-4cd0-a127-5ee4f2a5f716" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_eb18a8e0-ba1b-414b-a420-2cdf5511d61d" 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_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_eb18a8e0-ba1b-414b-a420-2cdf5511d61d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_0deecc6a-645a-47e7-882f-dbd03749197e" 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_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_0deecc6a-645a-47e7-882f-dbd03749197e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_4ba858b4-f9c0-49a8-9e33-7a44735504a0" 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_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_4ba858b4-f9c0-49a8-9e33-7a44735504a0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchaseAmount_65abb470-1130-4582-8936-dd60776ccd3f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRepurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_DebtInstrumentRepurchaseAmount_65abb470-1130-4582-8936-dd60776ccd3f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_b9bd7762-ad0c-4b3e-ab1c-bde1e1663cda" 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_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_RepaymentsOfDebt_b9bd7762-ad0c-4b3e-ab1c-bde1e1663cda" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_113a74bd-094b-44be-a54a-030dd9e98891" 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_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_113a74bd-094b-44be-a54a-030dd9e98891" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedLongTermDebt_9cad528f-df11-4e45-b0b4-02f34e853129" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubordinatedLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_SubordinatedLongTermDebt_9cad528f-df11-4e45-b0b4-02f34e853129" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_622db6c7-361d-4a68-a70b-b2396344f65b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_DebtInstrumentFairValue_622db6c7-361d-4a68-a70b-b2396344f65b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_cfcf52a2-2ebb-459f-9a8d-0a34fbf83f98" 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_1e92d035-b533-4b90-b540-0d81729e280e" xlink:to="loc_us-gaap_DebtInstrumentTable_cfcf52a2-2ebb-459f-9a8d-0a34fbf83f98" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_216ce2e3-7c4a-47c4-87cc-13430ab4f77b" 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_cfcf52a2-2ebb-459f-9a8d-0a34fbf83f98" xlink:to="loc_us-gaap_DebtInstrumentAxis_216ce2e3-7c4a-47c4-87cc-13430ab4f77b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_216ce2e3-7c4a-47c4-87cc-13430ab4f77b_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_216ce2e3-7c4a-47c4-87cc-13430ab4f77b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_216ce2e3-7c4a-47c4-87cc-13430ab4f77b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_47be7ffd-42f3-41fb-a674-d6b3fc8edd56" 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_216ce2e3-7c4a-47c4-87cc-13430ab4f77b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_47be7ffd-42f3-41fb-a674-d6b3fc8edd56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_RevolvingCreditFacilityMatureTwoThousandTwentySixMember_eae6525f-248d-4958-906a-7ae32865c2aa" xlink:href="bdc-20231001.xsd#bdc_RevolvingCreditFacilityMatureTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_47be7ffd-42f3-41fb-a674-d6b3fc8edd56" xlink:to="loc_bdc_RevolvingCreditFacilityMatureTwoThousandTwentySixMember_eae6525f-248d-4958-906a-7ae32865c2aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_A4.125SeniorSubordinatedNotesDue2026Member_18809150-ab14-4745-acd3-d1c26e3dde7a" xlink:href="bdc-20231001.xsd#bdc_A4.125SeniorSubordinatedNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_47be7ffd-42f3-41fb-a674-d6b3fc8edd56" xlink:to="loc_bdc_A4.125SeniorSubordinatedNotesDue2026Member_18809150-ab14-4745-acd3-d1c26e3dde7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_A3.375SeniorSubordinatedNotesDue2027Member_7aa5ab12-1572-4425-949c-5df02373a93c" xlink:href="bdc-20231001.xsd#bdc_A3.375SeniorSubordinatedNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_47be7ffd-42f3-41fb-a674-d6b3fc8edd56" xlink:to="loc_bdc_A3.375SeniorSubordinatedNotesDue2027Member_7aa5ab12-1572-4425-949c-5df02373a93c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_A3.875SeniorSubordinatedNotesDue2028Member_a72c4d4d-833a-43d5-a04c-ac3044efde7b" xlink:href="bdc-20231001.xsd#bdc_A3.875SeniorSubordinatedNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_47be7ffd-42f3-41fb-a674-d6b3fc8edd56" xlink:to="loc_bdc_A3.875SeniorSubordinatedNotesDue2028Member_a72c4d4d-833a-43d5-a04c-ac3044efde7b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_A3375SeniorSubordinatedNotesDue2031Member_28c613af-f983-4366-9957-c7967aefb56c" xlink:href="bdc-20231001.xsd#bdc_A3375SeniorSubordinatedNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_47be7ffd-42f3-41fb-a674-d6b3fc8edd56" xlink:to="loc_bdc_A3375SeniorSubordinatedNotesDue2031Member_28c613af-f983-4366-9957-c7967aefb56c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5f4bd5d6-0dad-42e9-9bb9-815539699c52" 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_cfcf52a2-2ebb-459f-9a8d-0a34fbf83f98" xlink:to="loc_srt_RangeAxis_5f4bd5d6-0dad-42e9-9bb9-815539699c52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5f4bd5d6-0dad-42e9-9bb9-815539699c52_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_5f4bd5d6-0dad-42e9-9bb9-815539699c52" xlink:to="loc_srt_RangeMember_5f4bd5d6-0dad-42e9-9bb9-815539699c52_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d0d24c55-059d-492f-a10d-15f04b653ca9" 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_5f4bd5d6-0dad-42e9-9bb9-815539699c52" xlink:to="loc_srt_RangeMember_d0d24c55-059d-492f-a10d-15f04b653ca9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d60205fe-06c8-47db-9a37-d24447dee295" 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_d0d24c55-059d-492f-a10d-15f04b653ca9" xlink:to="loc_srt_MinimumMember_d60205fe-06c8-47db-9a37-d24447dee295" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_562f2d42-3ce1-42d6-8be4-85b3798d8d66" 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_d0d24c55-059d-492f-a10d-15f04b653ca9" xlink:to="loc_srt_MaximumMember_562f2d42-3ce1-42d6-8be4-85b3798d8d66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_71bc10e0-f163-4cba-889c-69884b9a4ebd" 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_cfcf52a2-2ebb-459f-9a8d-0a34fbf83f98" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_71bc10e0-f163-4cba-889c-69884b9a4ebd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_71bc10e0-f163-4cba-889c-69884b9a4ebd_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_71bc10e0-f163-4cba-889c-69884b9a4ebd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_71bc10e0-f163-4cba-889c-69884b9a4ebd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_699a9253-9438-461d-9129-8f1c1c871fc9" 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_71bc10e0-f163-4cba-889c-69884b9a4ebd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_699a9253-9438-461d-9129-8f1c1c871fc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorSubordinatedNotesMember_19d605de-f7b2-49a5-ad9b-3c820c619a1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_699a9253-9438-461d-9129-8f1c1c871fc9" xlink:to="loc_us-gaap_SeniorSubordinatedNotesMember_19d605de-f7b2-49a5-ad9b-3c820c619a1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_3e81077c-2d15-4a55-a5c0-6f60e2f72b56" 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_cfcf52a2-2ebb-459f-9a8d-0a34fbf83f98" xlink:to="loc_us-gaap_VariableRateAxis_3e81077c-2d15-4a55-a5c0-6f60e2f72b56" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_3e81077c-2d15-4a55-a5c0-6f60e2f72b56_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_3e81077c-2d15-4a55-a5c0-6f60e2f72b56" xlink:to="loc_us-gaap_VariableRateDomain_3e81077c-2d15-4a55-a5c0-6f60e2f72b56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_307783fd-39b6-4041-bc96-241961798041" 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_3e81077c-2d15-4a55-a5c0-6f60e2f72b56" xlink:to="loc_us-gaap_VariableRateDomain_307783fd-39b6-4041-bc96-241961798041" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SecuredOvernightFinancingRateMember_6af98739-b4d5-43d9-ab3d-2b563ace82b4" xlink:href="bdc-20231001.xsd#bdc_SecuredOvernightFinancingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_307783fd-39b6-4041-bc96-241961798041" xlink:to="loc_bdc_SecuredOvernightFinancingRateMember_6af98739-b4d5-43d9-ab3d-2b563ace82b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_f94912cb-e46d-4e6f-9083-609f089ac93c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_307783fd-39b6-4041-bc96-241961798041" xlink:to="loc_us-gaap_BaseRateMember_f94912cb-e46d-4e6f-9083-609f089ac93c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/NetInvestmentHedgeDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#NetInvestmentHedgeDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/NetInvestmentHedgeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_f5804722-03e4-499d-9399-3ab84c56454d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SeniorSubordinatedDebtHedged_96f98311-11b4-4bfc-ac0f-7bdd03a6a5db" xlink:href="bdc-20231001.xsd#bdc_SeniorSubordinatedDebtHedged"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_f5804722-03e4-499d-9399-3ab84c56454d" xlink:to="loc_bdc_SeniorSubordinatedDebtHedged_96f98311-11b4-4bfc-ac0f-7bdd03a6a5db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_1657c379-fbbe-43d6-b4b1-48f3d537c2b5" 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_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_f5804722-03e4-499d-9399-3ab84c56454d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_1657c379-fbbe-43d6-b4b1-48f3d537c2b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_SeniorSubordinatedDebtDedesignated_aac35f5a-2dbd-4035-b2ff-e95d4ea26eda" xlink:href="bdc-20231001.xsd#bdc_SeniorSubordinatedDebtDedesignated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_f5804722-03e4-499d-9399-3ab84c56454d" xlink:to="loc_bdc_SeniorSubordinatedDebtDedesignated_aac35f5a-2dbd-4035-b2ff-e95d4ea26eda" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_32a454ae-64e7-46f5-87be-b2998c29f516" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_f5804722-03e4-499d-9399-3ab84c56454d" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_32a454ae-64e7-46f5-87be-b2998c29f516" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_b40783e6-4c46-41c5-a1b3-7873e916742a" 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_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_32a454ae-64e7-46f5-87be-b2998c29f516" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_b40783e6-4c46-41c5-a1b3-7873e916742a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b40783e6-4c46-41c5-a1b3-7873e916742a_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_b40783e6-4c46-41c5-a1b3-7873e916742a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b40783e6-4c46-41c5-a1b3-7873e916742a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ee30c4f5-7c35-46eb-a1fb-bb9179d5071e" 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_b40783e6-4c46-41c5-a1b3-7873e916742a" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ee30c4f5-7c35-46eb-a1fb-bb9179d5071e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorSubordinatedNotesMember_2e3e2266-e107-4f03-a063-79b63599b69f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ee30c4f5-7c35-46eb-a1fb-bb9179d5071e" xlink:to="loc_us-gaap_SeniorSubordinatedNotesMember_2e3e2266-e107-4f03-a063-79b63599b69f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/PensionandOtherPostretirementObligationsDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#PensionandOtherPostretirementObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/PensionandOtherPostretirementObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_aa5ec855-9242-4e34-a776-4bec89c071c2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_aa5ec855-9242-4e34-a776-4bec89c071c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_cfa12d81-18e8-4e3c-90cc-94136a4ce8aa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_cfa12d81-18e8-4e3c-90cc-94136a4ce8aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_d154179c-f571-43a3-9ae8-ee671c61f127" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_d154179c-f571-43a3-9ae8-ee671c61f127" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_5667c49e-50ab-4835-89f9-ebe7bc75e916" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_5667c49e-50ab-4835-89f9-ebe7bc75e916" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_5f7c87c1-d230-4918-b9a5-7b0efd5792ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_5f7c87c1-d230-4918-b9a5-7b0efd5792ad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_0f17786d-6001-4198-96e7-f279878ca77f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_0f17786d-6001-4198-96e7-f279878ca77f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_5756b00f-dd36-4d0b-adcc-f51af19fe4d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_5756b00f-dd36-4d0b-adcc-f51af19fe4d6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_48075cbd-e061-48ca-900f-3badfbfd3059" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_b00c42a3-f78c-48f7-82f6-f8dcdefc2dc7" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_48075cbd-e061-48ca-900f-3badfbfd3059" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_9ed2bd58-1d4a-4906-b0a5-e715defcc81f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_48075cbd-e061-48ca-900f-3badfbfd3059" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_9ed2bd58-1d4a-4906-b0a5-e715defcc81f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_9ed2bd58-1d4a-4906-b0a5-e715defcc81f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9ed2bd58-1d4a-4906-b0a5-e715defcc81f" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_9ed2bd58-1d4a-4906-b0a5-e715defcc81f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_36494dca-0714-4c91-8e92-50a358d6d446" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9ed2bd58-1d4a-4906-b0a5-e715defcc81f" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_36494dca-0714-4c91-8e92-50a358d6d446" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_503d6d2a-232d-48a3-ab11-547545ddae5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_36494dca-0714-4c91-8e92-50a358d6d446" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_503d6d2a-232d-48a3-ab11-547545ddae5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2a44eb58-fa7d-4315-89e4-46f0bd4cceee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_36494dca-0714-4c91-8e92-50a358d6d446" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_2a44eb58-fa7d-4315-89e4-46f0bd4cceee" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/ComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeLossComponentsofOtherComprehensiveIncomeLossNetofTaxDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#ComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeLossComponentsofOtherComprehensiveIncomeLossNetofTaxDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/ComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeLossComponentsofOtherComprehensiveIncomeLossNetofTaxDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_af1784b1-e604-4520-b171-676db3d5a129" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_deefed1b-77f2-42d9-9c45-49be3a828f46" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_af1784b1-e604-4520-b171-676db3d5a129" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_deefed1b-77f2-42d9-9c45-49be3a828f46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_05d7fa2f-99e0-4ed8-8c93-c51d25b49f46" 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_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_deefed1b-77f2-42d9-9c45-49be3a828f46" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_05d7fa2f-99e0-4ed8-8c93-c51d25b49f46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_9bcaf87f-b36f-423b-8e84-b9e80bd7e2d2" 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_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_deefed1b-77f2-42d9-9c45-49be3a828f46" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_9bcaf87f-b36f-423b-8e84-b9e80bd7e2d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_e74e6d20-e0c6-437e-b6b7-8fee016d3efb" 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_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_deefed1b-77f2-42d9-9c45-49be3a828f46" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_e74e6d20-e0c6-437e-b6b7-8fee016d3efb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_OtherComprehensiveIncomeLossNetOfTaxExcludingDeconsolidation_821020bb-bbcf-40ad-bf47-67436e68a76a" xlink:href="bdc-20231001.xsd#bdc_OtherComprehensiveIncomeLossNetOfTaxExcludingDeconsolidation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_deefed1b-77f2-42d9-9c45-49be3a828f46" xlink:to="loc_bdc_OtherComprehensiveIncomeLossNetOfTaxExcludingDeconsolidation_821020bb-bbcf-40ad-bf47-67436e68a76a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e226b538-c644-4f2c-8cec-5812d4276411" 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_AccumulatedOtherComprehensiveIncomeLossTable_b16041ca-da75-40b1-a4a8-e6c196bafeb6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_af1784b1-e604-4520-b171-676db3d5a129" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_b16041ca-da75-40b1-a4a8-e6c196bafeb6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_03b780f8-0492-469d-b80a-31aa0a8dccef" 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_AccumulatedOtherComprehensiveIncomeLossTable_b16041ca-da75-40b1-a4a8-e6c196bafeb6" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_03b780f8-0492-469d-b80a-31aa0a8dccef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_03b780f8-0492-469d-b80a-31aa0a8dccef_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_03b780f8-0492-469d-b80a-31aa0a8dccef" xlink:to="loc_us-gaap_EquityComponentDomain_03b780f8-0492-469d-b80a-31aa0a8dccef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_98d3d1a6-5c83-456c-b3a6-dd8677919e56" 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_03b780f8-0492-469d-b80a-31aa0a8dccef" xlink:to="loc_us-gaap_EquityComponentDomain_98d3d1a6-5c83-456c-b3a6-dd8677919e56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_57a2d339-1753-42f3-b4d5-ed4dc2edfce3" 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_98d3d1a6-5c83-456c-b3a6-dd8677919e56" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_57a2d339-1753-42f3-b4d5-ed4dc2edfce3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_98647dfd-06de-4e37-ad16-b7dbeef6d1f6" 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_57a2d339-1753-42f3-b4d5-ed4dc2edfce3" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_98647dfd-06de-4e37-ad16-b7dbeef6d1f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_d886445d-e3b3-470e-a887-f732677a9739" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_57a2d339-1753-42f3-b4d5-ed4dc2edfce3" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_d886445d-e3b3-470e-a887-f732677a9739" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/ComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeLossSummaryofEffectsofReclassificationsfromAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#ComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeLossSummaryofEffectsofReclassificationsfromAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/ComprehensiveIncomeandAccumulatedOtherComprehensiveIncomeLossSummaryofEffectsofReclassificationsfromAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_2be279c2-a8b4-4fda-9e21-1c7acf47b3fa" 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_OtherNonoperatingIncomeExpense_3036690e-94e0-444f-9355-46b46668ff9f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_2be279c2-a8b4-4fda-9e21-1c7acf47b3fa" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_3036690e-94e0-444f-9355-46b46668ff9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_548af86c-d467-42b9-b699-343516a97ba4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_2be279c2-a8b4-4fda-9e21-1c7acf47b3fa" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_548af86c-d467-42b9-b699-343516a97ba4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_5df698cd-a909-42a8-95d2-13905a5c0b9b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_2be279c2-a8b4-4fda-9e21-1c7acf47b3fa" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_5df698cd-a909-42a8-95d2-13905a5c0b9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_5c0891b9-f76e-4625-ab7a-5c5d9b9e18fa" 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_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_2be279c2-a8b4-4fda-9e21-1c7acf47b3fa" xlink:to="loc_us-gaap_NetIncomeLoss_5c0891b9-f76e-4625-ab7a-5c5d9b9e18fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_195b6cec-b826-4fd1-a6cd-bd4569f9738c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_2be279c2-a8b4-4fda-9e21-1c7acf47b3fa" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_195b6cec-b826-4fd1-a6cd-bd4569f9738c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_cd7b76d1-4ee7-42e1-be35-76cc1f862e22" 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_2be279c2-a8b4-4fda-9e21-1c7acf47b3fa" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_cd7b76d1-4ee7-42e1-be35-76cc1f862e22" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_71fb735b-4a79-4e40-ab70-def070bce3af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_cd7b76d1-4ee7-42e1-be35-76cc1f862e22" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_71fb735b-4a79-4e40-ab70-def070bce3af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_71fb735b-4a79-4e40-ab70-def070bce3af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_71fb735b-4a79-4e40-ab70-def070bce3af" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_71fb735b-4a79-4e40-ab70-def070bce3af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_d6c410ca-ef06-418e-b2f0-092406b40340" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_71fb735b-4a79-4e40-ab70-def070bce3af" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_d6c410ca-ef06-418e-b2f0-092406b40340" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_f3810da8-3154-4d17-9a85-92b03091cde8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_d6c410ca-ef06-418e-b2f0-092406b40340" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_f3810da8-3154-4d17-9a85-92b03091cde8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_fb4cfa68-dcb8-4dc5-aaa2-f81949e6e5da" 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_cd7b76d1-4ee7-42e1-be35-76cc1f862e22" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_fb4cfa68-dcb8-4dc5-aaa2-f81949e6e5da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_fb4cfa68-dcb8-4dc5-aaa2-f81949e6e5da_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_fb4cfa68-dcb8-4dc5-aaa2-f81949e6e5da" xlink:to="loc_us-gaap_EquityComponentDomain_fb4cfa68-dcb8-4dc5-aaa2-f81949e6e5da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9d08c6f9-b1f5-49cb-90f2-a8f599110341" 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_fb4cfa68-dcb8-4dc5-aaa2-f81949e6e5da" xlink:to="loc_us-gaap_EquityComponentDomain_9d08c6f9-b1f5-49cb-90f2-a8f599110341" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_8cece6f2-b800-44f3-a0f8-147f3f949d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9d08c6f9-b1f5-49cb-90f2-a8f599110341" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_8cece6f2-b800-44f3-a0f8-147f3f949d9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_9d2df56d-0158-483b-8089-eb6a861473e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9d08c6f9-b1f5-49cb-90f2-a8f599110341" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember_9d2df56d-0158-483b-8089-eb6a861473e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_b1787762-852c-4c9e-8a5f-77e1c731764a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9d08c6f9-b1f5-49cb-90f2-a8f599110341" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_b1787762-852c-4c9e-8a5f-77e1c731764a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.belden.com/role/ShareRepurchaseDetails" xlink:type="simple" xlink:href="bdc-20231001.xsd#ShareRepurchaseDetails"/>
  <link:definitionLink xlink:role="http://www.belden.com/role/ShareRepurchaseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_515552ab-6ffc-49e3-aea8-8bf637df96a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_f2925606-d2e8-4dd0-b922-8a66022fc5cd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_515552ab-6ffc-49e3-aea8-8bf637df96a8" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_f2925606-d2e8-4dd0-b922-8a66022fc5cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_StockRepurchaseProgramAdditionalAuthorizedAmount_6704a29d-3aeb-4d8d-bafe-7f44e22b159c" xlink:href="bdc-20231001.xsd#bdc_StockRepurchaseProgramAdditionalAuthorizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_515552ab-6ffc-49e3-aea8-8bf637df96a8" xlink:to="loc_bdc_StockRepurchaseProgramAdditionalAuthorizedAmount_6704a29d-3aeb-4d8d-bafe-7f44e22b159c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_83e54732-f762-4323-a056-bc059385c853" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_515552ab-6ffc-49e3-aea8-8bf637df96a8" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_83e54732-f762-4323-a056-bc059385c853" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_3b5ad7eb-7ab8-4ef9-93a3-69a5bac5b224" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_515552ab-6ffc-49e3-aea8-8bf637df96a8" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_3b5ad7eb-7ab8-4ef9-93a3-69a5bac5b224" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_ec59157d-b7f9-4355-826f-fe9f16d6997f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_515552ab-6ffc-49e3-aea8-8bf637df96a8" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_ec59157d-b7f9-4355-826f-fe9f16d6997f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_6ae11619-4c72-40bd-8a6e-b6963149c926" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_515552ab-6ffc-49e3-aea8-8bf637df96a8" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_6ae11619-4c72-40bd-8a6e-b6963149c926" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_7efe6828-6754-41f3-b8fb-c9d21983a552" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_515552ab-6ffc-49e3-aea8-8bf637df96a8" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_7efe6828-6754-41f3-b8fb-c9d21983a552" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_0dcea05b-7fce-4970-9c17-9aec50a2cf72" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_7efe6828-6754-41f3-b8fb-c9d21983a552" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_0dcea05b-7fce-4970-9c17-9aec50a2cf72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_0dcea05b-7fce-4970-9c17-9aec50a2cf72_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_0dcea05b-7fce-4970-9c17-9aec50a2cf72" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_0dcea05b-7fce-4970-9c17-9aec50a2cf72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_18c0d94b-b488-4062-8203-c5adb883a10b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_0dcea05b-7fce-4970-9c17-9aec50a2cf72" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_18c0d94b-b488-4062-8203-c5adb883a10b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bdc_A11292018ShareRepurchaseProgramMember_bf28c346-074f-4267-917c-251569d807e1" xlink:href="bdc-20231001.xsd#bdc_A11292018ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_18c0d94b-b488-4062-8203-c5adb883a10b" xlink:to="loc_bdc_A11292018ShareRepurchaseProgramMember_bf28c346-074f-4267-917c-251569d807e1" 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_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="1"/>
    <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_OtherAssetsNoncurrent" 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" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
