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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e2298-abc2-7e56-a3f8-4d8c0747a3b8,g:5d2268d7-6854-47c7-a274-c8be9091c50b-->
<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.cnx.com/role/COVER" xlink:type="simple" xlink:href="cnx-20260630.xsd#COVER"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/COVER" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019e2298-ad13-7386-ab1c-d13c645b4490" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntitiesTable_019e2298-ad13-7386-ab1c-d13c645b4490" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019e2298-ad13-713a-b3ef-51a017d7bff0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019e2298-ad13-7386-ab1c-d13c645b4490" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019e2298-ad13-713a-b3ef-51a017d7bff0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e2298-ad13-713a-b3ef-51a017d7bff0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e2298-ad13-713a-b3ef-51a017d7bff0" xlink:to="loc_us-gaap_ClassOfStockDomain_019e2298-ad13-713a-b3ef-51a017d7bff0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e2298-ad13-7699-9d54-ca4c3a3c5b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e2298-ad13-713a-b3ef-51a017d7bff0" xlink:to="loc_us-gaap_ClassOfStockDomain_019e2298-ad13-7699-9d54-ca4c3a3c5b7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e2298-ad13-70ff-aac4-be5d74aac3fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e2298-ad13-7699-9d54-ca4c3a3c5b7c" xlink:to="loc_us-gaap_CommonStockMember_019e2298-ad13-70ff-aac4-be5d74aac3fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_PreferredSharePurchaseRightsMember_019e2298-ad13-7a7a-a19f-ca3c51114187" xlink:href="cnx-20260630.xsd#cnx_PreferredSharePurchaseRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e2298-ad13-7699-9d54-ca4c3a3c5b7c" xlink:to="loc_cnx_PreferredSharePurchaseRightsMember_019e2298-ad13-7a7a-a19f-ca3c51114187" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019e2298-ad13-7071-b088-588d3897c976" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_DocumentType_019e2298-ad13-7071-b088-588d3897c976" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019e2298-ad13-703c-81ef-af4a3e17eebd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_DocumentQuarterlyReport_019e2298-ad13-703c-81ef-af4a3e17eebd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019e2298-ad13-753b-a889-81cba642743c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_DocumentPeriodEndDate_019e2298-ad13-753b-a889-81cba642743c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019e2298-ad13-779c-9b7f-09a61cd577a5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_DocumentTransitionReport_019e2298-ad13-779c-9b7f-09a61cd577a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019e2298-ad13-7afd-af44-39803d8ffbe6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityFileNumber_019e2298-ad13-7afd-af44-39803d8ffbe6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019e2298-ad13-761b-b6ae-bdf6afccb81f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityRegistrantName_019e2298-ad13-761b-b6ae-bdf6afccb81f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019e2298-ad13-7ea3-b9ad-a49069a2bf2c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019e2298-ad13-7ea3-b9ad-a49069a2bf2c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019e2298-ad13-74e5-b806-35d9fc6bf607" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityTaxIdentificationNumber_019e2298-ad13-74e5-b806-35d9fc6bf607" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019e2298-ad13-7816-9bb0-8cc57dc04b09" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityAddressAddressLine1_019e2298-ad13-7816-9bb0-8cc57dc04b09" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019e2298-ad13-7a76-a46f-75bc17d33e4a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityAddressAddressLine2_019e2298-ad13-7a76-a46f-75bc17d33e4a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019e2298-ad13-7713-b290-a0ce2f892a2f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityAddressCityOrTown_019e2298-ad13-7713-b290-a0ce2f892a2f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019e2298-ad13-7125-b6c4-b589b0ac09d0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityAddressStateOrProvince_019e2298-ad13-7125-b6c4-b589b0ac09d0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019e2298-ad13-7268-8132-eddfcf2729b6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityAddressPostalZipCode_019e2298-ad13-7268-8132-eddfcf2729b6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019e2298-ad13-7b18-b9b8-f11517e2d86a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_CityAreaCode_019e2298-ad13-7b18-b9b8-f11517e2d86a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019e2298-ad13-7d85-8ce3-91f79ce571d6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_LocalPhoneNumber_019e2298-ad13-7d85-8ce3-91f79ce571d6" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019e2298-ad13-7d1e-ace2-402c2bafbaf9" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_Security12bTitle_019e2298-ad13-7d1e-ace2-402c2bafbaf9" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019e2298-ad13-769a-a7a5-6713e1a7d447" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_TradingSymbol_019e2298-ad13-769a-a7a5-6713e1a7d447" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019e2298-ad13-7a58-8520-a27785a87291" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_SecurityExchangeName_019e2298-ad13-7a58-8520-a27785a87291" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019e2298-ad13-77bb-b35f-8cfa03215d4d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityCurrentReportingStatus_019e2298-ad13-77bb-b35f-8cfa03215d4d" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019e2298-ad13-78e6-863e-84d2785fb118" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityInteractiveDataCurrent_019e2298-ad13-78e6-863e-84d2785fb118" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019e2298-ad13-795a-bcfc-c85b7500b986" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityFilerCategory_019e2298-ad13-795a-bcfc-c85b7500b986" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019e2298-ad13-7f70-afed-1e491ece7038" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntitySmallBusiness_019e2298-ad13-7f70-afed-1e491ece7038" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019e2298-ad13-7318-9828-c748df5140a8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityEmergingGrowthCompany_019e2298-ad13-7318-9828-c748df5140a8" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019e2298-ad13-7922-90c0-83759ada0bc1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityShellCompany_019e2298-ad13-7922-90c0-83759ada0bc1" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019e2298-ad13-7cb1-93a4-cb49025546e2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019e2298-ad13-7cb1-93a4-cb49025546e2" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019e2298-ad13-7a20-b650-88f9775716d3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_AmendmentFlag_019e2298-ad13-7a20-b650-88f9775716d3" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019e2298-ad13-7d1b-9409-08d4efb6d38f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_DocumentFiscalYearFocus_019e2298-ad13-7d1b-9409-08d4efb6d38f" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019e2298-ad13-705e-8690-ae4b6a9f1ee2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019e2298-ad13-705e-8690-ae4b6a9f1ee2" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_NoTradingSymbolFlag_019e2298-ad13-7b75-a4f9-ab0bbcde0baf" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_NoTradingSymbolFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_NoTradingSymbolFlag_019e2298-ad13-7b75-a4f9-ab0bbcde0baf" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019e2298-ad13-7fed-a2fb-87d995c5363b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_CurrentFiscalYearEndDate_019e2298-ad13-7fed-a2fb-87d995c5363b" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019e2298-ad13-7d2b-b594-759f168336a1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019e2298-ad13-7a01-952c-975e07d7020a" xlink:to="loc_dei_EntityCentralIndexKey_019e2298-ad13-7d2b-b594-759f168336a1" xlink:type="arc" order="30"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="simple" xlink:href="cnx-20260630.xsd#CONSOLIDATEDSTATEMENTSOFINCOME"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/CONSOLIDATEDSTATEMENTSOFINCOME" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e2298-ad13-7195-ba34-4bef562736c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_StatementTable_019e2298-ad13-7195-ba34-4bef562736c7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e2298-ad13-7ee7-bbc0-0e1cd2ebf313" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e2298-ad13-7195-ba34-4bef562736c7" xlink:to="loc_srt_ProductOrServiceAxis_019e2298-ad13-7ee7-bbc0-0e1cd2ebf313" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2298-ad13-7ee7-bbc0-0e1cd2ebf313_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e2298-ad13-7ee7-bbc0-0e1cd2ebf313" xlink:to="loc_srt_ProductsAndServicesDomain_019e2298-ad13-7ee7-bbc0-0e1cd2ebf313_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2298-ad13-75dd-b819-caa44893a673" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e2298-ad13-7ee7-bbc0-0e1cd2ebf313" xlink:to="loc_srt_ProductsAndServicesDomain_019e2298-ad13-75dd-b819-caa44893a673" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OilAndGasServiceMember_019e2298-ad13-7382-b2b4-65f590ed4d29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OilAndGasServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-ad13-75dd-b819-caa44893a673" xlink:to="loc_us-gaap_OilAndGasServiceMember_019e2298-ad13-7382-b2b4-65f590ed4d29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OilAndGasPurchasedMember_019e2298-ad13-7b47-acf3-6eaab71a5e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OilAndGasPurchasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-ad13-75dd-b819-caa44893a673" xlink:to="loc_us-gaap_OilAndGasPurchasedMember_019e2298-ad13-7b47-acf3-6eaab71a5e9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember_019e2298-ad13-77bf-9a9c-5fe61d418383" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-ad13-75dd-b819-caa44893a673" xlink:to="loc_us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember_019e2298-ad13-77bf-9a9c-5fe61d418383" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OilAndGasExplorationAndProductionMember_019e2298-ad13-7b67-9b0f-ddd3e2556536" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OilAndGasExplorationAndProductionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-ad13-75dd-b819-caa44893a673" xlink:to="loc_us-gaap_OilAndGasExplorationAndProductionMember_019e2298-ad13-7b67-9b0f-ddd3e2556536" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019e2298-ad13-75c4-9afe-cb50ffa99e5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_RevenuesAbstract_019e2298-ad13-75c4-9afe-cb50ffa99e5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2298-ad13-7ed5-a53f-46a5b36600ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e2298-ad13-75c4-9afe-cb50ffa99e5e" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2298-ad13-7ed5-a53f-46a5b36600ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-ad13-74e3-8d84-6f5f7740a7d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnOilAndGasHedgingActivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e2298-ad13-75c4-9afe-cb50ffa99e5e" xlink:to="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-ad13-74e3-8d84-6f5f7740a7d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_OtherRevenueAndOperatingIncome_019e2298-ad13-75c5-94f1-763ca5372bca" xlink:href="cnx-20260630.xsd#cnx_OtherRevenueAndOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e2298-ad13-75c4-9afe-cb50ffa99e5e" xlink:to="loc_cnx_OtherRevenueAndOperatingIncome_019e2298-ad13-75c5-94f1-763ca5372bca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e2298-ad13-7d8d-a938-4bb2b6856f8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019e2298-ad13-75c4-9afe-cb50ffa99e5e" xlink:to="loc_us-gaap_Revenues_019e2298-ad13-7d8d-a938-4bb2b6856f8c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_019e2298-ad13-70e1-8648-32ba61cb9c69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_019e2298-ad13-70e1-8648-32ba61cb9c69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019e2298-ad13-70e1-8648-32ba61cb9c69" xlink:to="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_019e2298-ad13-7eb0-a7df-c6ce2619b74e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:to="loc_us-gaap_OperatingLeaseExpense_019e2298-ad13-7eb0-a7df-c6ce2619b74e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductionTaxExpense_019e2298-ad13-7228-b3bc-2b6bcdf72f23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductionTaxExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:to="loc_us-gaap_ProductionTaxExpense_019e2298-ad13-7228-b3bc-2b6bcdf72f23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019e2298-ad13-706d-bfbf-0adc9448787f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019e2298-ad13-706d-bfbf-0adc9448787f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019e2298-ad13-7cdb-804b-57548a85c1aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019e2298-ad13-7cdb-804b-57548a85c1aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_ProductionRoyaltyInterestsandPurchasedGasCosts_019e2298-ad13-7e1e-92bd-5e6f11330cca" xlink:href="cnx-20260630.xsd#cnx_ProductionRoyaltyInterestsandPurchasedGasCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:to="loc_cnx_ProductionRoyaltyInterestsandPurchasedGasCosts_019e2298-ad13-7e1e-92bd-5e6f11330cca" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities_019e2298-ad13-79f7-ae16-1ad4b894cef1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:to="loc_us-gaap_ResultsOfOperationsGeneralAndAdministrativeRelatedToOilAndGasProducingActivities_019e2298-ad13-79f7-ae16-1ad4b894cef1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingIncomeExpenseNet_019e2298-ad13-7d9a-be66-b2f285e05217" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherOperatingIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:to="loc_us-gaap_OtherOperatingIncomeExpenseNet_019e2298-ad13-7d9a-be66-b2f285e05217" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019e2298-ad13-7a65-9eda-77d874da38da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019e2298-ad13-7047-a4ba-56a1217be253" xlink:to="loc_us-gaap_OperatingExpenses_019e2298-ad13-7a65-9eda-77d874da38da" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_019e2298-ad13-75e7-8c8c-28bf6970b0b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019e2298-ad13-70e1-8648-32ba61cb9c69" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_019e2298-ad13-75e7-8c8c-28bf6970b0b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingExpense_019e2298-ad13-7930-9cf7-acc59944a309" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_019e2298-ad13-75e7-8c8c-28bf6970b0b1" xlink:to="loc_us-gaap_OtherNonoperatingExpense_019e2298-ad13-7930-9cf7-acc59944a309" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_019e2298-ad13-7ff7-b284-e3fac99ef740" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_019e2298-ad13-75e7-8c8c-28bf6970b0b1" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_019e2298-ad13-7ff7-b284-e3fac99ef740" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e2298-ad13-78e3-9a3b-cded85289f85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_019e2298-ad13-75e7-8c8c-28bf6970b0b1" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e2298-ad13-78e3-9a3b-cded85289f85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019e2298-ad13-7976-ba3f-ab0e8fdafc72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_019e2298-ad13-75e7-8c8c-28bf6970b0b1" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019e2298-ad13-7976-ba3f-ab0e8fdafc72" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019e2298-ad13-786c-8ba6-5bfe4c99e436" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNonoperatingIncomeExpenseAbstract_019e2298-ad13-75e7-8c8c-28bf6970b0b1" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019e2298-ad13-786c-8ba6-5bfe4c99e436" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_019e2298-ad13-737a-9e90-f30cace2be6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_CostsAndExpenses_019e2298-ad13-737a-9e90-f30cace2be6a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_019e2298-ad13-72e6-9e34-7e6fc286a3a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_019e2298-ad13-72e6-9e34-7e6fc286a3a4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e2298-ad13-7bb6-b2ce-fc6369aadd25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e2298-ad13-7bb6-b2ce-fc6369aadd25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2298-ad13-71e7-b650-186c12db222d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_NetIncomeLoss_019e2298-ad13-71e7-b650-186c12db222d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_019e2298-ad13-74f2-adfa-6b0b3d8ffee7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_EarningsPerShareAbstract_019e2298-ad13-74f2-adfa-6b0b3d8ffee7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019e2298-ad13-7fab-b065-54ab5026d68d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019e2298-ad13-74f2-adfa-6b0b3d8ffee7" xlink:to="loc_us-gaap_EarningsPerShareBasic_019e2298-ad13-7fab-b065-54ab5026d68d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019e2298-ad13-7eea-a532-36b90bd17973" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_019e2298-ad13-74f2-adfa-6b0b3d8ffee7" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019e2298-ad13-7eea-a532-36b90bd17973" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019e2298-ad13-76bd-8b15-73593cce257d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7ea9-926e-3434d0c138e6" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019e2298-ad13-76bd-8b15-73593cce257d" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="cnx-20260630.xsd#CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2298-ad13-7bd1-b2e5-737d94d4d1a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e2298-ad13-7a1b-b638-dd77b2392f71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7bd1-b2e5-737d94d4d1a5" xlink:to="loc_us-gaap_StatementTable_019e2298-ad13-7a1b-b638-dd77b2392f71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e2298-ad13-782b-a06d-e06835143a95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e2298-ad13-7a1b-b638-dd77b2392f71" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e2298-ad13-782b-a06d-e06835143a95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2298-ad13-782b-a06d-e06835143a95_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e2298-ad13-782b-a06d-e06835143a95" xlink:to="loc_us-gaap_EquityComponentDomain_019e2298-ad13-782b-a06d-e06835143a95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e2298-ad13-7bad-bb08-f71907beee46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e2298-ad13-782b-a06d-e06835143a95" xlink:to="loc_us-gaap_EquityComponentDomain_019e2298-ad13-7bad-bb08-f71907beee46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e2298-ad13-7f8b-be81-aee682e3ee5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2298-ad13-7bad-bb08-f71907beee46" xlink:to="loc_us-gaap_CommonStockMember_019e2298-ad13-7f8b-be81-aee682e3ee5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e2298-ad13-74c6-bdda-f77b1ab69ed2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2298-ad13-7bad-bb08-f71907beee46" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e2298-ad13-74c6-bdda-f77b1ab69ed2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e2298-ad13-7fd8-99fd-73a44db7ef4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2298-ad13-7bad-bb08-f71907beee46" xlink:to="loc_us-gaap_RetainedEarningsMember_019e2298-ad13-7fd8-99fd-73a44db7ef4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2298-ad13-7db6-bae4-05ec4e37def6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e2298-ad13-7bad-bb08-f71907beee46" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e2298-ad13-7db6-bae4-05ec4e37def6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7bd1-b2e5-737d94d4d1a5" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2298-ad13-76a3-93e6-7d12ae982ae7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_StockholdersEquity_019e2298-ad13-76a3-93e6-7d12ae982ae7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2298-ad13-7363-9370-fa3cb934bf36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_NetIncomeLoss_019e2298-ad13-7363-9370-fa3cb934bf36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019e2298-ad13-7705-8749-11178045d5ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019e2298-ad13-7705-8749-11178045d5ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019e2298-ad13-7a1f-b412-5c279bb0d4a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019e2298-ad13-7a1f-b412-5c279bb0d4a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019e2298-ad13-7e8d-8ede-819416375873" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019e2298-ad13-7e8d-8ede-819416375873" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_019f7e98-6566-7384-8d6f-2408ff1347e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_019f7e98-6566-7384-8d6f-2408ff1347e6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e2298-ad13-7529-addc-138781eed98c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019e2298-ad13-7529-addc-138781eed98c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_019e2298-ad13-789b-b686-644192c09c3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_019e2298-ad13-789b-b686-644192c09c3a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e2298-ad13-7077-a7f8-5d4ebd8b3cd5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e2298-ad13-72ef-8133-282daa1dbf77" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019e2298-ad13-7077-a7f8-5d4ebd8b3cd5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019e2298-ad13-72d3-b89f-e98ca8904e72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="cnx-20260630.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e2298-ad13-7a70-a186-072b8968a563" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e2298-ad13-706d-a692-566819334a13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7a70-a186-072b8968a563" xlink:to="loc_us-gaap_StatementTable_019e2298-ad13-706d-a692-566819334a13" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2298-ad13-70db-a4ed-24d4436f2652" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e2298-ad13-706d-a692-566819334a13" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2298-ad13-70db-a4ed-24d4436f2652" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-ad13-70db-a4ed-24d4436f2652_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-ad13-70db-a4ed-24d4436f2652" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-ad13-70db-a4ed-24d4436f2652_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-ad13-79e5-9a94-5e82a0bb2e53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-ad13-70db-a4ed-24d4436f2652" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-ad13-79e5-9a94-5e82a0bb2e53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CNXMRevolvingCreditFacilityMember_019e2298-ad13-7dc6-ac81-77a4f29bd3ed" xlink:href="cnx-20260630.xsd#cnx_CNXMRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-ad13-79e5-9a94-5e82a0bb2e53" xlink:to="loc_cnx_CNXMRevolvingCreditFacilityMember_019e2298-ad13-7dc6-ac81-77a4f29bd3ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CNXRevolvingCreditFacilityMember_019e2298-ad13-71ed-bb57-f043c2ca28ba" xlink:href="cnx-20260630.xsd#cnx_CNXRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-ad13-79e5-9a94-5e82a0bb2e53" xlink:to="loc_cnx_CNXRevolvingCreditFacilityMember_019e2298-ad13-71ed-bb57-f043c2ca28ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CNXSeniorNotesMember_019e2298-ad13-7a94-9310-676e1162a99c" xlink:href="cnx-20260630.xsd#cnx_CNXSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-ad13-79e5-9a94-5e82a0bb2e53" xlink:to="loc_cnx_CNXSeniorNotesMember_019e2298-ad13-7a94-9310-676e1162a99c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7600-82fa-d0b829fee58e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7a70-a186-072b8968a563" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7600-82fa-d0b829fee58e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2298-ad13-7690-b8f4-19e31e2865c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7600-82fa-d0b829fee58e" xlink:to="loc_us-gaap_NetIncomeLoss_019e2298-ad13-7690-b8f4-19e31e2865c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7600-82fa-d0b829fee58e" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019e2298-ad13-7474-a393-0ab91427981b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019e2298-ad13-7474-a393-0ab91427981b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAmortizationOfDeferredCharges_019e2298-ad13-78ba-8d06-ad5b3231f561" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAmortizationOfDeferredCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_OtherAmortizationOfDeferredCharges_019e2298-ad13-78ba-8d06-ad5b3231f561" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019e2298-ad13-7494-94bd-fc05050ec0f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_ShareBasedCompensation_019e2298-ad13-7494-94bd-fc05050ec0f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherAssets_019e2298-ad13-710d-b13a-6b26cd9ebb55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherAssets_019e2298-ad13-710d-b13a-6b26cd9ebb55" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e2298-ad13-708a-a628-f8fae1f092f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e2298-ad13-708a-a628-f8fae1f092f6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-ad13-7c25-a01a-dc14c8e1daae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnOilAndGasHedgingActivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-ad13-7c25-a01a-dc14c8e1daae" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseCashCollateralFromCounterparties_019e2298-ad13-7c5e-8e96-9feb254c8e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseCashCollateralFromCounterparties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_IncreaseDecreaseCashCollateralFromCounterparties_019e2298-ad13-7c5e-8e96-9feb254c8e6a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019e2298-ad13-7d76-9a42-f8750b7713e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019e2298-ad13-7d76-9a42-f8750b7713e3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_019e2298-ad13-72cf-969a-93f004d35060" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_019e2298-ad13-72cf-969a-93f004d35060" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_019e2298-ad13-773c-8689-f0b78c2f315d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_019e2298-ad13-773c-8689-f0b78c2f315d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable_019e2298-ad13-7aea-a198-52c07fb90716" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_019e2298-ad13-773c-8689-f0b78c2f315d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable_019e2298-ad13-7aea-a198-52c07fb90716" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_019e2298-ad13-7e07-a723-faab8dea6e41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_019e2298-ad13-773c-8689-f0b78c2f315d" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_019e2298-ad13-7e07-a723-faab8dea6e41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_019e2298-ad13-71b5-b7bc-8c24834e6dea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingAssetsAbstract_019e2298-ad13-773c-8689-f0b78c2f315d" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidExpense_019e2298-ad13-71b5-b7bc-8c24834e6dea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019e2298-ad13-79ae-a106-64ce3d57a558" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_019e2298-ad13-79ae-a106-64ce3d57a558" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_019e2298-ad13-7541-8fd6-a1e0d1d92f73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_019e2298-ad13-7541-8fd6-a1e0d1d92f73" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019e2298-ad13-7015-b96d-6d3f16882925" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_019e2298-ad13-7541-8fd6-a1e0d1d92f73" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019e2298-ad13-7015-b96d-6d3f16882925" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_019e2298-ad13-7f7c-aa54-8a4a9bc60e67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInterestPayableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_019e2298-ad13-7541-8fd6-a1e0d1d92f73" xlink:to="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_019e2298-ad13-7f7c-aa54-8a4a9bc60e67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019e2298-ad13-78fc-ae2d-4c0cd7c1c8aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingLiabilitiesAbstract_019e2298-ad13-7541-8fd6-a1e0d1d92f73" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_019e2298-ad13-78fc-ae2d-4c0cd7c1c8aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherAccruedLiabilities_019e2298-ad13-7a83-9c61-e1abeba27aca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7740-898f-cf96efe1f29b" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherAccruedLiabilities_019e2298-ad13-7a83-9c61-e1abeba27aca" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e2298-ad13-7f16-b0e2-9bdcfefaabfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019e2298-ad13-7600-82fa-d0b829fee58e" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e2298-ad13-7f16-b0e2-9bdcfefaabfa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019e2298-ad13-7894-b8c1-aa72f82b067f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7a70-a186-072b8968a563" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019e2298-ad13-7894-b8c1-aa72f82b067f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019e2298-ad13-751d-988e-00fbdd3b8303" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019e2298-ad13-7894-b8c1-aa72f82b067f" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019e2298-ad13-751d-988e-00fbdd3b8303" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_019e2298-ad13-7340-a705-393206a6d5ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019e2298-ad13-7894-b8c1-aa72f82b067f" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_019e2298-ad13-7340-a705-393206a6d5ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_PaymentsForProceedsFromInvestmentInEquityAffiliates_019e2298-ad13-7901-a96b-4a007b74b5a7" xlink:href="cnx-20260630.xsd#cnx_PaymentsForProceedsFromInvestmentInEquityAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019e2298-ad13-7894-b8c1-aa72f82b067f" xlink:to="loc_cnx_PaymentsForProceedsFromInvestmentInEquityAffiliates_019e2298-ad13-7901-a96b-4a007b74b5a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019e2298-ad13-7eb6-b1e5-36aaaac14d40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019e2298-ad13-7894-b8c1-aa72f82b067f" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019e2298-ad13-7eb6-b1e5-36aaaac14d40" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e2298-ad13-76d4-bb0e-467f1b4c64b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019e2298-ad13-7894-b8c1-aa72f82b067f" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e2298-ad13-76d4-bb0e-467f1b4c64b7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7a70-a186-072b8968a563" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium_019e2298-ad13-7193-8bfb-7cdc3de60f7b" xlink:href="cnx-20260630.xsd#cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_cnx_PaymentsOnLongTermNotesIncludingRedemptionPremium_019e2298-ad13-7193-8bfb-7cdc3de60f7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_019e2298-ad13-78eb-8ea2-977fd3de9600" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_019e2298-ad13-78eb-8ea2-977fd3de9600" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_019e2298-ad13-7ae4-9cdc-7ba2fae2cfdd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_019e2298-ad13-7ae4-9cdc-7ba2fae2cfdd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_019e2298-ad13-733d-837c-970dc7c28d05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_019e2298-ad13-733d-837c-970dc7c28d05" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfOtherDebt_019e2298-ad13-7534-9ca2-7fea7e742781" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfOtherDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_RepaymentsOfOtherDebt_019e2298-ad13-7534-9ca2-7fea7e742781" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019e2298-ad13-7809-833f-b12d9e51eeef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019e2298-ad13-7809-833f-b12d9e51eeef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019e2298-ad13-7bc3-942e-b0c40e5a8532" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019e2298-ad13-7bc3-942e-b0c40e5a8532" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019e2298-ad13-7059-82a5-98df42015210" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019e2298-ad13-7059-82a5-98df42015210" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_019e2298-ad13-7683-825e-9b266ede18a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_019e2298-ad13-7683-825e-9b266ede18a9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e2298-ad13-73cb-8316-fd0845b69c51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019e2298-ad13-7613-a807-bbe6672d512c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e2298-ad13-73cb-8316-fd0845b69c51" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019e2298-ad13-72ee-a02c-dd0dff2b9864" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7a70-a186-072b8968a563" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019e2298-ad13-72ee-a02c-dd0dff2b9864" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e2298-ad13-7328-a8ea-7b6497dc248e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e2298-ad13-7a70-a186-072b8968a563" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e2298-ad13-7328-a8ea-7b6497dc248e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e2298-ad13-762a-87e8-3f78d2b31c10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/BASISOFPRESENTATIONScheduleofAllowanceforCreditLossesDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#BASISOFPRESENTATIONScheduleofAllowanceforCreditLossesDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/BASISOFPRESENTATIONScheduleofAllowanceforCreditLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e2298-adcb-70f3-b5d6-7e0b003205f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e2298-adcb-7c87-8041-8293482afbcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e2298-adcb-70f3-b5d6-7e0b003205f2" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e2298-adcb-7c87-8041-8293482afbcc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019e2298-adcb-7d3e-a4ba-7f188dea7def" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019e2298-adcb-7c87-8041-8293482afbcc" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019e2298-adcb-7d3e-a4ba-7f188dea7def" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_019e2298-adcb-7d3e-a4ba-7f188dea7def_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019e2298-adcb-7d3e-a4ba-7f188dea7def" xlink:to="loc_us-gaap_ReceivableTypeDomain_019e2298-adcb-7d3e-a4ba-7f188dea7def_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivableTypeDomain_019e2298-adcb-77fa-93c6-10dfa795ca7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReceivableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis_019e2298-adcb-7d3e-a4ba-7f188dea7def" xlink:to="loc_us-gaap_ReceivableTypeDomain_019e2298-adcb-77fa-93c6-10dfa795ca7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeAccountsReceivableMember_019e2298-adcb-7e83-8ea9-8318e468b822" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeAccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_019e2298-adcb-77fa-93c6-10dfa795ca7a" xlink:to="loc_us-gaap_TradeAccountsReceivableMember_019e2298-adcb-7e83-8ea9-8318e468b822" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_OtherReceivablesMember_019e2298-adcb-7a8d-82de-080b7b567840" xlink:href="cnx-20260630.xsd#cnx_OtherReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReceivableTypeDomain_019e2298-adcb-77fa-93c6-10dfa795ca7a" xlink:to="loc_cnx_OtherReceivablesMember_019e2298-adcb-7a8d-82de-080b7b567840" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_019e2298-adcb-72c8-a8a9-977af8ec9a7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019e2298-adcb-70f3-b5d6-7e0b003205f2" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_019e2298-adcb-72c8-a8a9-977af8ec9a7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_019e2298-adcb-7f82-a8d9-4f2b41e3aca0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_019e2298-adcb-72c8-a8a9-977af8ec9a7d" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_019e2298-adcb-7f82-a8d9-4f2b41e3aca0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_019e2298-adcb-7895-bfe9-4698ab23b2cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_019e2298-adcb-72c8-a8a9-977af8ec9a7d" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_019e2298-adcb-7895-bfe9-4698ab23b2cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_019e2298-adcb-714a-9b36-447951722e6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/EARNINGSPERSHARENarrativeDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#EARNINGSPERSHARENarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/EARNINGSPERSHARENarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedLineItems_019e2298-adcb-7cc9-8286-0bd40268f3d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDilutedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_019e2298-adcb-7efd-858c-8b139a67cb5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_019e2298-adcb-7cc9-8286-0bd40268f3d9" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_019e2298-adcb-7efd-858c-8b139a67cb5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7c23-bb6a-808ecbc22b4c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_019e2298-adcb-7efd-858c-8b139a67cb5a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7c23-bb6a-808ecbc22b4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7c23-bb6a-808ecbc22b4c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7c23-bb6a-808ecbc22b4c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7c23-bb6a-808ecbc22b4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7dc8-9c55-bd187a5a38ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7c23-bb6a-808ecbc22b4c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7dc8-9c55-bd187a5a38ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019e2298-adcb-7c65-a0a5-f9c804b73202" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7dc8-9c55-bd187a5a38ee" xlink:to="loc_us-gaap_ConvertibleDebtMember_019e2298-adcb-7c65-a0a5-f9c804b73202" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7be4-b921-2c27ac500ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_019e2298-adcb-7efd-858c-8b139a67cb5a" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7be4-b921-2c27ac500ee6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-7be4-b921-2c27ac500ee6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7be4-b921-2c27ac500ee6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-7be4-b921-2c27ac500ee6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-76b4-96cc-8ccd48044eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7be4-b921-2c27ac500ee6" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-76b4-96cc-8ccd48044eb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_Convertible225SeniorNotesDue2026Member_019e2298-adcb-784f-8586-4337e6573dfe" xlink:href="cnx-20260630.xsd#cnx_Convertible225SeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-76b4-96cc-8ccd48044eb4" xlink:to="loc_cnx_Convertible225SeniorNotesDue2026Member_019e2298-adcb-784f-8586-4337e6573dfe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019f8f80-1ff0-7147-8d4a-80c71d59ccbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareDilutedByCommonClassTable_019e2298-adcb-7efd-858c-8b139a67cb5a" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019f8f80-1ff0-7147-8d4a-80c71d59ccbf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f8f80-1ff0-7147-8d4a-80c71d59ccbf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f8f80-1ff0-7147-8d4a-80c71d59ccbf" xlink:to="loc_us-gaap_ClassOfStockDomain_019f8f80-1ff0-7147-8d4a-80c71d59ccbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f8f80-1ff0-7832-87a4-4cf1cf2f53d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f8f80-1ff0-7147-8d4a-80c71d59ccbf" xlink:to="loc_us-gaap_ClassOfStockDomain_019f8f80-1ff0-7832-87a4-4cf1cf2f53d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019f8f80-1ff0-7e39-83fe-58315fed4a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f8f80-1ff0-7832-87a4-4cf1cf2f53d6" xlink:to="loc_us-gaap_CommonStockMember_019f8f80-1ff0-7e39-83fe-58315fed4a4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e2298-adcb-750c-a993-fbcf3b511b19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_019e2298-adcb-7cc9-8286-0bd40268f3d9" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e2298-adcb-750c-a993-fbcf3b511b19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019f8f80-1ff0-7275-9681-179e02ae7625" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedLineItems_019e2298-adcb-7cc9-8286-0bd40268f3d9" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019f8f80-1ff0-7275-9681-179e02ae7625" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/EARNINGSPERSHAREScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#EARNINGSPERSHAREScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/EARNINGSPERSHAREScheduleofAntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-7dc9-a2bb-f4e2571fef4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2298-adcb-79e0-9d9e-7e6c38db5927" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-7dc9-a2bb-f4e2571fef4a" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2298-adcb-79e0-9d9e-7e6c38db5927" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2298-adcb-7a35-bb0a-d7d04b087de0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2298-adcb-79e0-9d9e-7e6c38db5927" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2298-adcb-7a35-bb0a-d7d04b087de0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2298-adcb-7a35-bb0a-d7d04b087de0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2298-adcb-7a35-bb0a-d7d04b087de0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2298-adcb-7a35-bb0a-d7d04b087de0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2298-adcb-7875-a02a-9efef4734843" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e2298-adcb-7a35-bb0a-d7d04b087de0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2298-adcb-7875-a02a-9efef4734843" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e2298-adcb-787b-b37f-7e9c0db68cf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2298-adcb-7875-a02a-9efef4734843" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e2298-adcb-787b-b37f-7e9c0db68cf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_PerformanceShareUnitsMember_019e2298-adcb-73cf-bb31-83566f246033" xlink:href="cnx-20260630.xsd#cnx_PerformanceShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e2298-adcb-7875-a02a-9efef4734843" xlink:to="loc_cnx_PerformanceShareUnitsMember_019e2298-adcb-73cf-bb31-83566f246033" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e2298-adcb-760e-939e-091e88c9c846" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-7dc9-a2bb-f4e2571fef4a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019e2298-adcb-760e-939e-091e88c9c846" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/EARNINGSPERSHAREScheduleofSharebasedCompensationDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#EARNINGSPERSHAREScheduleofSharebasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/EARNINGSPERSHAREScheduleofSharebasedCompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2298-adcb-7b40-88c8-77ee166113c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2298-adcb-772f-a53b-5b92806b2b61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2298-adcb-7b40-88c8-77ee166113c3" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2298-adcb-772f-a53b-5b92806b2b61" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e2298-adcb-7663-96e5-67caad141101" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e2298-adcb-772f-a53b-5b92806b2b61" xlink:to="loc_us-gaap_AwardTypeAxis_019e2298-adcb-7663-96e5-67caad141101" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7663-96e5-67caad141101_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e2298-adcb-7663-96e5-67caad141101" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7663-96e5-67caad141101_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7511-b4ba-1b8c9c07f648" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e2298-adcb-7663-96e5-67caad141101" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7511-b4ba-1b8c9c07f648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019e2298-adcb-70d9-9f91-2104c2d08e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7511-b4ba-1b8c9c07f648" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019e2298-adcb-70d9-9f91-2104c2d08e9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019e2298-adcb-702f-88a3-e41603947db6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7511-b4ba-1b8c9c07f648" xlink:to="loc_us-gaap_RestrictedStockMember_019e2298-adcb-702f-88a3-e41603947db6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_PerformanceShareUnitsMember_019e2298-adcb-7fc6-a46d-c56c4f0ec798" xlink:href="cnx-20260630.xsd#cnx_PerformanceShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7511-b4ba-1b8c9c07f648" xlink:to="loc_cnx_PerformanceShareUnitsMember_019e2298-adcb-7fc6-a46d-c56c4f0ec798" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019e2298-adcb-730a-9967-1fa3139c188a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2298-adcb-7b40-88c8-77ee166113c3" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019e2298-adcb-730a-9967-1fa3139c188a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_019e2298-adcb-721f-90bf-8e23f2578168" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2298-adcb-7b40-88c8-77ee166113c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_019e2298-adcb-721f-90bf-8e23f2578168" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019e2298-adcb-7e65-aa29-03e420cebcb1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e2298-adcb-7b40-88c8-77ee166113c3" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019e2298-adcb-7e65-aa29-03e420cebcb1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/EARNINGSPERSHAREScheduleofEarningsLossPerShareBasicandDilutedDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#EARNINGSPERSHAREScheduleofEarningsLossPerShareBasicandDilutedDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/EARNINGSPERSHAREScheduleofEarningsLossPerShareBasicandDilutedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2298-adcb-7b56-b202-ba36be371e70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2298-adcb-7b56-b202-ba36be371e70" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e2298-adcb-723b-9ea1-4902310b2983" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2298-adcb-7b56-b202-ba36be371e70" xlink:to="loc_us-gaap_AwardTypeAxis_019e2298-adcb-723b-9ea1-4902310b2983" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-723b-9ea1-4902310b2983_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e2298-adcb-723b-9ea1-4902310b2983" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-723b-9ea1-4902310b2983_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7ec5-a5a4-515610f3eb0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e2298-adcb-723b-9ea1-4902310b2983" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7ec5-a5a4-515610f3eb0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019e2298-adcb-7922-847c-e065e27e746a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7ec5-a5a4-515610f3eb0a" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019e2298-adcb-7922-847c-e065e27e746a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e2298-adcb-7282-a5f0-bd24c23f22eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7ec5-a5a4-515610f3eb0a" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e2298-adcb-7282-a5f0-bd24c23f22eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_PerformanceShareUnitsMember_019e2298-adcb-79d9-8aab-ddf4e653bd15" xlink:href="cnx-20260630.xsd#cnx_PerformanceShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e2298-adcb-7ec5-a5a4-515610f3eb0a" xlink:to="loc_cnx_PerformanceShareUnitsMember_019e2298-adcb-79d9-8aab-ddf4e653bd15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7bbf-b0f5-cf943331bcac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019e2298-adcb-7b56-b202-ba36be371e70" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7bbf-b0f5-cf943331bcac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7bbf-b0f5-cf943331bcac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7bbf-b0f5-cf943331bcac" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7bbf-b0f5-cf943331bcac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7bd4-9070-86463903e5b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7bbf-b0f5-cf943331bcac" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7bd4-9070-86463903e5b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019e2298-adcb-7c9c-a7a3-02cfbb776e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7bd4-9070-86463903e5b5" xlink:to="loc_us-gaap_ConvertibleDebtMember_019e2298-adcb-7c9c-a7a3-02cfbb776e1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e2298-adcb-7e7f-87bd-274ad9b53dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:to="loc_us-gaap_NetIncomeLoss_019e2298-adcb-7e7f-87bd-274ad9b53dd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e2298-adcb-7e3d-b454-ba68deaf596b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019e2298-adcb-7e3d-b454-ba68deaf596b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DilutiveSecuritiesAbstract_019e2298-adcb-74b0-9778-c3a58daf91e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DilutiveSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:to="loc_us-gaap_DilutiveSecuritiesAbstract_019e2298-adcb-74b0-9778-c3a58daf91e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestOnConvertibleDebtNetOfTax_019e2298-adcb-789e-b40f-035edc79fbfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestOnConvertibleDebtNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DilutiveSecuritiesAbstract_019e2298-adcb-74b0-9778-c3a58daf91e8" xlink:to="loc_us-gaap_InterestOnConvertibleDebtNetOfTax_019e2298-adcb-789e-b40f-035edc79fbfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e2298-adcb-7ab9-81c2-1e2be52930f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DilutiveSecuritiesAbstract_019e2298-adcb-74b0-9778-c3a58daf91e8" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019e2298-adcb-7ab9-81c2-1e2be52930f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e2298-adcb-78db-81f7-cc9dbd16b63d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019e2298-adcb-78db-81f7-cc9dbd16b63d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019e2298-adcb-709b-add7-82cce7d04fde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019e2298-adcb-709b-add7-82cce7d04fde" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e2298-adcb-79ad-b25a-9deca728330c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019e2298-adcb-79ad-b25a-9deca728330c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_EarningsPerShareBasicAndDilutedEPSAbstract_019e2298-adcb-7833-a205-f76d536d91d5" xlink:href="cnx-20260630.xsd#cnx_EarningsPerShareBasicAndDilutedEPSAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019e2298-adcb-74e2-a6fc-c3f3fae53708" xlink:to="loc_cnx_EarningsPerShareBasicAndDilutedEPSAbstract_019e2298-adcb-7833-a205-f76d536d91d5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019e2298-adcb-7c5a-8581-96b5bca4dc4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cnx_EarningsPerShareBasicAndDilutedEPSAbstract_019e2298-adcb-7833-a205-f76d536d91d5" xlink:to="loc_us-gaap_EarningsPerShareBasic_019e2298-adcb-7c5a-8581-96b5bca4dc4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019e2298-adcb-7763-9fe2-44bb91142ff8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cnx_EarningsPerShareBasicAndDilutedEPSAbstract_019e2298-adcb-7833-a205-f76d536d91d5" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019e2298-adcb-7763-9fe2-44bb91142ff8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSNarrativeDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#REVENUEFROMCONTRACTSWITHCUSTOMERSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e2298-adcb-73aa-8e10-b5df5eadab2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e2298-adcb-73aa-8e10-b5df5eadab2b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e2298-adcb-7cee-85b2-b309404775b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e2298-adcb-73aa-8e10-b5df5eadab2b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e2298-adcb-7cee-85b2-b309404775b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_ContractsWithCustomersPaymentTerms_019e2298-adcb-76af-81f1-98d9c596b4df" xlink:href="cnx-20260630.xsd#cnx_ContractsWithCustomersPaymentTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_cnx_ContractsWithCustomersPaymentTerms_019e2298-adcb-76af-81f1-98d9c596b4df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_019e2298-adcb-7412-8dd6-bd6f89a903b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerAssetNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_us-gaap_ContractWithCustomerAssetNet_019e2298-adcb-7412-8dd6-bd6f89a903b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e2298-adcb-7307-87a1-b0bcf96c13b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e2298-adcb-7307-87a1-b0bcf96c13b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e2298-adcb-7a01-b302-b1825f483611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e2298-adcb-7a01-b302-b1825f483611" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSNarrativeDetails_1" xlink:type="simple" xlink:href="cnx-20260630.xsd#REVENUEFROMCONTRACTSWITHCUSTOMERSNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e2298-adcb-73aa-8e10-b5df5eadab2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e2298-adcb-73aa-8e10-b5df5eadab2b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_ContractsWithCustomersPaymentTerms_019e2298-adcb-76af-81f1-98d9c596b4df" xlink:href="cnx-20260630.xsd#cnx_ContractsWithCustomersPaymentTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_cnx_ContractsWithCustomersPaymentTerms_019e2298-adcb-76af-81f1-98d9c596b4df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_019e2298-adcb-7412-8dd6-bd6f89a903b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerAssetNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_us-gaap_ContractWithCustomerAssetNet_019e2298-adcb-7412-8dd6-bd6f89a903b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e2298-adcb-7307-87a1-b0bcf96c13b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e2298-adcb-7307-87a1-b0bcf96c13b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e2298-adcb-7a01-b302-b1825f483611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7343-a235-aa0a213ec6e7" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e2298-adcb-7a01-b302-b1825f483611" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSScheduleofDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#REVENUEFROMCONTRACTSWITHCUSTOMERSScheduleofDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSScheduleofDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7d0e-8d79-1ef6feeb45af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e2298-adcb-7504-993b-98e23986483a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7d0e-8d79-1ef6feeb45af" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e2298-adcb-7504-993b-98e23986483a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e2298-adcb-7843-95ca-a55a28e29022" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e2298-adcb-7504-993b-98e23986483a" xlink:to="loc_srt_ProductOrServiceAxis_019e2298-adcb-7843-95ca-a55a28e29022" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2298-adcb-7843-95ca-a55a28e29022_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e2298-adcb-7843-95ca-a55a28e29022" xlink:to="loc_srt_ProductsAndServicesDomain_019e2298-adcb-7843-95ca-a55a28e29022_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2298-adcb-7291-a42b-0a1dc1f8cee3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e2298-adcb-7843-95ca-a55a28e29022" xlink:to="loc_srt_ProductsAndServicesDomain_019e2298-adcb-7291-a42b-0a1dc1f8cee3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OilAndGasServiceMember_019e2298-adcb-7700-8996-95f333fe5cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OilAndGasServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-adcb-7291-a42b-0a1dc1f8cee3" xlink:to="loc_us-gaap_OilAndGasServiceMember_019e2298-adcb-7700-8996-95f333fe5cf6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasReservesMember_019e2298-adcb-73a3-98bc-991b88e1d3cf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NaturalGasReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OilAndGasServiceMember_019e2298-adcb-7700-8996-95f333fe5cf6" xlink:to="loc_srt_NaturalGasReservesMember_019e2298-adcb-73a3-98bc-991b88e1d3cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_NGLsMember_019e2298-adcb-787b-9022-9516ab5ffa6f" xlink:href="cnx-20260630.xsd#cnx_NGLsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OilAndGasServiceMember_019e2298-adcb-7700-8996-95f333fe5cf6" xlink:to="loc_cnx_NGLsMember_019e2298-adcb-787b-9022-9516ab5ffa6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OilAndCondensateMember_019e2298-adcb-75cc-9f4c-fd0cf5243aae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OilAndCondensateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OilAndGasServiceMember_019e2298-adcb-7700-8996-95f333fe5cf6" xlink:to="loc_us-gaap_OilAndCondensateMember_019e2298-adcb-75cc-9f4c-fd0cf5243aae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OilAndGasPurchasedMember_019e2298-adcb-73c8-93ae-d4d4ec862309" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OilAndGasPurchasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-adcb-7291-a42b-0a1dc1f8cee3" xlink:to="loc_us-gaap_OilAndGasPurchasedMember_019e2298-adcb-73c8-93ae-d4d4ec862309" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2298-adcb-7552-87b2-6435eabac0ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7d0e-8d79-1ef6feeb45af" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2298-adcb-7552-87b2-6435eabac0ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-adcb-7a61-8dac-bd185a5cfe44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnOilAndGasHedgingActivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7d0e-8d79-1ef6feeb45af" xlink:to="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-adcb-7a61-8dac-bd185a5cfe44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_OtherRevenueAndOperatingIncome_019e2298-adcb-778b-a987-b49f831354b0" xlink:href="cnx-20260630.xsd#cnx_OtherRevenueAndOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7d0e-8d79-1ef6feeb45af" xlink:to="loc_cnx_OtherRevenueAndOperatingIncome_019e2298-adcb-778b-a987-b49f831354b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e2298-adcb-7361-8f25-1d7b57771577" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e2298-adcb-7d0e-8d79-1ef6feeb45af" xlink:to="loc_us-gaap_Revenues_019e2298-adcb-7361-8f25-1d7b57771577" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/ACQUISITIONSANDDISPOSITIONSDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#ACQUISITIONSANDDISPOSITIONSDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/ACQUISITIONSANDDISPOSITIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019e2298-adcb-7936-8b2b-59773bdb5c54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e2298-adcb-7689-b004-f88c3dea1569" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e2298-adcb-7936-8b2b-59773bdb5c54" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e2298-adcb-7689-b004-f88c3dea1569" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019e2298-adcb-7608-854a-014cb18cd9ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e2298-adcb-7689-b004-f88c3dea1569" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019e2298-adcb-7608-854a-014cb18cd9ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2298-adcb-7608-854a-014cb18cd9ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e2298-adcb-7608-854a-014cb18cd9ec" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2298-adcb-7608-854a-014cb18cd9ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2298-adcb-712c-92ec-a2edd7713e43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e2298-adcb-7608-854a-014cb18cd9ec" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2298-adcb-712c-92ec-a2edd7713e43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_ApexEnergyIILLCMember_019e2298-adcb-7e5d-9b44-9af089fb59fe" xlink:href="cnx-20260630.xsd#cnx_ApexEnergyIILLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e2298-adcb-712c-92ec-a2edd7713e43" xlink:to="loc_cnx_ApexEnergyIILLCMember_019e2298-adcb-7e5d-9b44-9af089fb59fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019e2298-adcb-7d62-9364-633bfe639bec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e2298-adcb-7936-8b2b-59773bdb5c54" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019e2298-adcb-7d62-9364-633bfe639bec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_019e2298-adcb-7d10-894f-5dc30e344d26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e2298-adcb-7936-8b2b-59773bdb5c54" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_019e2298-adcb-7d10-894f-5dc30e344d26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019e2298-adcb-73ad-98c0-729508f5a8c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e2298-adcb-7936-8b2b-59773bdb5c54" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019e2298-adcb-73ad-98c0-729508f5a8c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireRoyaltyInterestsInMiningProperties_019ec988-9fa5-75a9-9d66-1f344cdabe4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireRoyaltyInterestsInMiningProperties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e2298-adcb-7936-8b2b-59773bdb5c54" xlink:to="loc_us-gaap_PaymentsToAcquireRoyaltyInterestsInMiningProperties_019ec988-9fa5-75a9-9d66-1f344cdabe4b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/INCOMETAXESDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#INCOMETAXESDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/INCOMETAXESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019f95aa-d8f6-797f-8fff-bbcd0af93ccc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTable_019f95aa-d8f6-73ef-852a-d9b319ca7f53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019f95aa-d8f6-797f-8fff-bbcd0af93ccc" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTable_019f95aa-d8f6-73ef-852a-d9b319ca7f53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019f95aa-d8f6-7b4f-a56c-a86f759f29ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTable_019f95aa-d8f6-73ef-852a-d9b319ca7f53" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019f95aa-d8f6-7b4f-a56c-a86f759f29ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019f95aa-d8f6-7b4f-a56c-a86f759f29ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019f95aa-d8f6-7b4f-a56c-a86f759f29ba" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019f95aa-d8f6-7b4f-a56c-a86f759f29ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019f95aa-d8f6-7123-b057-6ea4fbb073fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019f95aa-d8f6-7b4f-a56c-a86f759f29ba" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019f95aa-d8f6-7123-b057-6ea4fbb073fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019f95aa-d8f6-7aef-b5e7-c05442d52b71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019f95aa-d8f6-7123-b057-6ea4fbb073fb" xlink:to="loc_us-gaap_SubsequentEventMember_019f95aa-d8f6-7aef-b5e7-c05442d52b71" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019e2298-adcb-7e71-a56a-0202b8f3073d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019f95aa-d8f6-797f-8fff-bbcd0af93ccc" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019e2298-adcb-7e71-a56a-0202b8f3073d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxCreditsAndAdjustments_019f92a4-bb2f-7038-9f63-1d181a92094d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxCreditsAndAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019f95aa-d8f6-797f-8fff-bbcd0af93ccc" xlink:to="loc_us-gaap_IncomeTaxCreditsAndAdjustments_019f92a4-bb2f-7038-9f63-1d181a92094d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_019e2298-adcb-78a5-acb4-521294068f76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019f95aa-d8f6-797f-8fff-bbcd0af93ccc" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_019e2298-adcb-78a5-acb4-521294068f76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_019e2298-adcb-7302-83ef-50bec273223d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019f95aa-d8f6-797f-8fff-bbcd0af93ccc" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_019e2298-adcb-7302-83ef-50bec273223d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_019e2298-adcb-7fc6-9461-a03f28682e03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019f95aa-d8f6-797f-8fff-bbcd0af93ccc" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_019e2298-adcb-7fc6-9461-a03f28682e03" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_019e2298-adcb-745c-9895-bdf45f058a5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateReconciliationLineItems_019f95aa-d8f6-797f-8fff-bbcd0af93ccc" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_019e2298-adcb-745c-9895-bdf45f058a5c" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/REVOLVINGCREDITFACILITIESDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#REVOLVINGCREDITFACILITIESDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/REVOLVINGCREDITFACILITIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShortTermDebtTable_019e2298-adcb-74c8-a7d8-a9de2f2634d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShortTermDebtTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_019e2298-adcb-74c8-a7d8-a9de2f2634d9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2298-adcb-73c5-9c10-e7f0f15a9990" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_019e2298-adcb-74c8-a7d8-a9de2f2634d9" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2298-adcb-73c5-9c10-e7f0f15a9990" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-73c5-9c10-e7f0f15a9990_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2298-adcb-73c5-9c10-e7f0f15a9990" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-73c5-9c10-e7f0f15a9990_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-7412-8618-95cdbe061863" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2298-adcb-73c5-9c10-e7f0f15a9990" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-7412-8618-95cdbe061863" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2298-adcb-7d9f-abcb-4311e9901c54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-7412-8618-95cdbe061863" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2298-adcb-7d9f-abcb-4311e9901c54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e2298-adcb-738d-894c-77ae704017b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-7412-8618-95cdbe061863" xlink:to="loc_us-gaap_LineOfCreditMember_019e2298-adcb-738d-894c-77ae704017b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019e2298-adcb-748f-9c67-5a12bf8a9118" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_019e2298-adcb-74c8-a7d8-a9de2f2634d9" xlink:to="loc_us-gaap_VariableRateAxis_019e2298-adcb-748f-9c67-5a12bf8a9118" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e2298-adcb-748f-9c67-5a12bf8a9118_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019e2298-adcb-748f-9c67-5a12bf8a9118" xlink:to="loc_us-gaap_VariableRateDomain_019e2298-adcb-748f-9c67-5a12bf8a9118_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e2298-adcb-7b3a-bcef-481186a14f77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019e2298-adcb-748f-9c67-5a12bf8a9118" xlink:to="loc_us-gaap_VariableRateDomain_019e2298-adcb-7b3a-bcef-481186a14f77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_FederalFundsOpenRateMember_019e2298-adcb-7a1c-92f7-ae5404d4d202" xlink:href="cnx-20260630.xsd#cnx_FederalFundsOpenRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e2298-adcb-7b3a-bcef-481186a14f77" xlink:to="loc_cnx_FederalFundsOpenRateMember_019e2298-adcb-7a1c-92f7-ae5404d4d202" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_OneMonthSOFRMember_019e2298-adcb-7c72-9812-59edc4ead8cb" xlink:href="cnx-20260630.xsd#cnx_OneMonthSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e2298-adcb-7b3a-bcef-481186a14f77" xlink:to="loc_cnx_OneMonthSOFRMember_019e2298-adcb-7c72-9812-59edc4ead8cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e2298-adcb-7565-88f7-edc1600d8660" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e2298-adcb-7b3a-bcef-481186a14f77" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e2298-adcb-7565-88f7-edc1600d8660" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e2298-adcb-7326-b88a-4f269978d54a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_019e2298-adcb-74c8-a7d8-a9de2f2634d9" xlink:to="loc_srt_RangeAxis_019e2298-adcb-7326-b88a-4f269978d54a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2298-adcb-7326-b88a-4f269978d54a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e2298-adcb-7326-b88a-4f269978d54a" xlink:to="loc_srt_RangeMember_019e2298-adcb-7326-b88a-4f269978d54a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e2298-adcb-7f5d-a376-b25dddf6bbc5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e2298-adcb-7326-b88a-4f269978d54a" xlink:to="loc_srt_RangeMember_019e2298-adcb-7f5d-a376-b25dddf6bbc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e2298-adcb-7570-a79e-3ad1fb8135ad" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e2298-adcb-7f5d-a376-b25dddf6bbc5" xlink:to="loc_srt_MinimumMember_019e2298-adcb-7570-a79e-3ad1fb8135ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e2298-adcb-78a3-8171-70750d3ee82b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e2298-adcb-7f5d-a376-b25dddf6bbc5" xlink:to="loc_srt_MaximumMember_019e2298-adcb-78a3-8171-70750d3ee82b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e2298-adcb-793e-ba24-9ea0cab650eb" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_019e2298-adcb-74c8-a7d8-a9de2f2634d9" xlink:to="loc_dei_LegalEntityAxis_019e2298-adcb-793e-ba24-9ea0cab650eb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e2298-adcb-793e-ba24-9ea0cab650eb_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e2298-adcb-793e-ba24-9ea0cab650eb" xlink:to="loc_dei_EntityDomain_019e2298-adcb-793e-ba24-9ea0cab650eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e2298-adcb-7b1e-a597-8dabc078ff99" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e2298-adcb-793e-ba24-9ea0cab650eb" xlink:to="loc_dei_EntityDomain_019e2298-adcb-7b1e-a597-8dabc078ff99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CNXMMember_019e2298-adcb-7bb1-8988-4d6bf0ca67f7" xlink:href="cnx-20260630.xsd#cnx_CNXMMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e2298-adcb-7b1e-a597-8dabc078ff99" xlink:to="loc_cnx_CNXMMember_019e2298-adcb-7bb1-8988-4d6bf0ca67f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DebtInstrumentBorrowingBase_019e2298-adcb-7796-aedd-ae46d5b4cec4" xlink:href="cnx-20260630.xsd#cnx_DebtInstrumentBorrowingBase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_cnx_DebtInstrumentBorrowingBase_019e2298-adcb-7796-aedd-ae46d5b4cec4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_019e2298-adcb-7ed1-a1d1-39ced534401c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_us-gaap_LineOfCreditFacilityCapacityAvailableForSpecificPurposeOtherThanForTradePurchases_019e2298-adcb-7ed1-a1d1-39ced534401c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e2298-adcb-7e88-a0f1-1d77a1b65f11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e2298-adcb-7e88-a0f1-1d77a1b65f11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DebtInstrumentNetLeverageRatio_019e2298-adcb-7aa2-96d0-f5fc252f47a8" xlink:href="cnx-20260630.xsd#cnx_DebtInstrumentNetLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_cnx_DebtInstrumentNetLeverageRatio_019e2298-adcb-7aa2-96d0-f5fc252f47a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_MinimumCurrentRatioPerCreditFacility_019e2298-adcb-7382-9a63-422c8c20206f" xlink:href="cnx-20260630.xsd#cnx_MinimumCurrentRatioPerCreditFacility"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_cnx_MinimumCurrentRatioPerCreditFacility_019e2298-adcb-7382-9a63-422c8c20206f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019e2298-adcb-7b03-b3ca-bd78f5d2a3f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_us-gaap_LineOfCredit_019e2298-adcb-7b03-b3ca-bd78f5d2a3f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019e2298-adcb-75fe-ae22-94840dd93f36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019e2298-adcb-75fe-ae22-94840dd93f36" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_LettersOfCreditAmountOutstanding_019e2298-adcb-721d-a1ec-21ebe8f168f4" xlink:href="cnx-20260630.xsd#cnx_LettersOfCreditAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_cnx_LettersOfCreditAmountOutstanding_019e2298-adcb-721d-a1ec-21ebe8f168f4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019e2298-adcb-7dfd-8338-3f8cb540f920" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019e2298-adcb-7dfd-8338-3f8cb540f920" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2298-adcb-7d57-863b-bc911016bf2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e2298-adcb-7d57-863b-bc911016bf2e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_InterestRatioPerCreditFacilityCovenant_019e2298-adcb-7bb9-9461-3363f9f72738" xlink:href="cnx-20260630.xsd#cnx_InterestRatioPerCreditFacilityCovenant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_cnx_InterestRatioPerCreditFacilityCovenant_019e2298-adcb-7bb9-9461-3363f9f72738" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CreditFacilityDebtCovenantSecuredLeverageRatio_019e2298-adcb-76ec-8579-8e845e5edf47" xlink:href="cnx-20260630.xsd#cnx_CreditFacilityDebtCovenantSecuredLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_cnx_CreditFacilityDebtCovenantSecuredLeverageRatio_019e2298-adcb-76ec-8579-8e845e5edf47" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DebtInstrumentInterestCoverageRatio_019e2298-adcb-7646-92bc-3027395b07a7" xlink:href="cnx-20260630.xsd#cnx_DebtInstrumentInterestCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_cnx_DebtInstrumentInterestCoverageRatio_019e2298-adcb-7646-92bc-3027395b07a7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019e2298-adcb-7eca-8646-e78a14814779" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_019e2298-adcb-7d1f-99eb-39177e3e7fa7" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_019e2298-adcb-7eca-8646-e78a14814779" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/LONGTERMDEBTScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#LONGTERMDEBTScheduleofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/LONGTERMDEBTScheduleofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-7b0a-b590-5ba8d6b79d07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-7b0a-b590-5ba8d6b79d07" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-78e8-a5ea-2c5811e4364f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-7b0a-b590-5ba8d6b79d07" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-78e8-a5ea-2c5811e4364f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-78e8-a5ea-2c5811e4364f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-78e8-a5ea-2c5811e4364f" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-78e8-a5ea-2c5811e4364f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-78e8-a5ea-2c5811e4364f" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_Convertible7.25SeniorNotesDue2032Member_019e2298-adcb-79b6-a090-f4b009e6ef38" xlink:href="cnx-20260630.xsd#cnx_Convertible7.25SeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:to="loc_cnx_Convertible7.25SeniorNotesDue2032Member_019e2298-adcb-79b6-a090-f4b009e6ef38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_SeniorNotesDueMarch2034Member_019e2298-adcb-7e6a-9436-3ef119eb8fe9" xlink:href="cnx-20260630.xsd#cnx_SeniorNotesDueMarch2034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:to="loc_cnx_SeniorNotesDueMarch2034Member_019e2298-adcb-7e6a-9436-3ef119eb8fe9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_SeniorNotesDueJanuary2031Member_019e2298-adcb-7162-9c20-59e0456c1628" xlink:href="cnx-20260630.xsd#cnx_SeniorNotesDueJanuary2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:to="loc_cnx_SeniorNotesDueJanuary2031Member_019e2298-adcb-7162-9c20-59e0456c1628" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_SeniorNotesDueApril2030Member_019e2298-adcb-7db7-aa69-e2dc40835dfb" xlink:href="cnx-20260630.xsd#cnx_SeniorNotesDueApril2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:to="loc_cnx_SeniorNotesDueApril2030Member_019e2298-adcb-7db7-aa69-e2dc40835dfb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CNXRevolvingCreditFacilityMember_019e2298-adcb-7cad-966f-081c90197530" xlink:href="cnx-20260630.xsd#cnx_CNXRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:to="loc_cnx_CNXRevolvingCreditFacilityMember_019e2298-adcb-7cad-966f-081c90197530" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CNXMidstreamPartnersLPRevolvingCreditFacilityMember_019e2298-adcb-72dd-9c10-c35be104ee03" xlink:href="cnx-20260630.xsd#cnx_CNXMidstreamPartnersLPRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:to="loc_cnx_CNXMidstreamPartnersLPRevolvingCreditFacilityMember_019e2298-adcb-72dd-9c10-c35be104ee03" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_SeniorNotesDueJanuary2029Member_019e2298-adcb-7a18-ac5e-6d559f3ea4ab" xlink:href="cnx-20260630.xsd#cnx_SeniorNotesDueJanuary2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:to="loc_cnx_SeniorNotesDueJanuary2029Member_019e2298-adcb-7a18-ac5e-6d559f3ea4ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_Convertible225SeniorNotesDue2026Member_019e2298-adcb-7e71-a6b9-d2290efd8bd6" xlink:href="cnx-20260630.xsd#cnx_Convertible225SeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70be-9dff-bd3a002193ac" xlink:to="loc_cnx_Convertible225SeniorNotesDue2026Member_019e2298-adcb-7e71-a6b9-d2290efd8bd6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e2298-adcb-7cd7-b169-15cfc17ec8a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-7b0a-b590-5ba8d6b79d07" xlink:to="loc_us-gaap_CreditFacilityAxis_019e2298-adcb-7cd7-b169-15cfc17ec8a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-7cd7-b169-15cfc17ec8a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2298-adcb-7cd7-b169-15cfc17ec8a0" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-7cd7-b169-15cfc17ec8a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-780c-8f54-8517dbfa7aad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e2298-adcb-7cd7-b169-15cfc17ec8a0" xlink:to="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-780c-8f54-8517dbfa7aad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e2298-adcb-7416-af24-9aa371357c2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e2298-adcb-780c-8f54-8517dbfa7aad" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e2298-adcb-7416-af24-9aa371357c2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e2298-adcb-7bfd-9107-09eaef3fd56e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e2298-adcb-7bfd-9107-09eaef3fd56e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e2298-adcb-7b7e-83cd-43c762c106ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e2298-adcb-7b7e-83cd-43c762c106ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountCurrent_019e2298-adcb-735a-a609-f89260cce5c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountCurrent_019e2298-adcb-735a-a609-f89260cce5c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e2298-adcb-7ff4-ac26-ae108a62d0a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:to="loc_us-gaap_LongTermDebt_019e2298-adcb-7ff4-ac26-ae108a62d0a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_019e2298-adcb-7b12-baa8-6ae7fc0454b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_019e2298-adcb-7b12-baa8-6ae7fc0454b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019e2298-adcb-75d0-97ba-a26ebb505b7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:to="loc_us-gaap_LongTermDebtCurrent_019e2298-adcb-75d0-97ba-a26ebb505b7f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019e2298-adcb-7971-b18f-19090d4cf210" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7cdf-b5f0-441ca3ab6e25" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019e2298-adcb-7971-b18f-19090d4cf210" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/LONGTERMDEBTNarrativeDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#LONGTERMDEBTNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/LONGTERMDEBTNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019f7ece-1b19-7be7-90b4-5afa84123a39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_DebtInstrumentTable_019f7ece-1b19-7be7-90b4-5afa84123a39" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019f7ece-1b19-7211-9065-3b76302cc79b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019f7ece-1b19-7be7-90b4-5afa84123a39" xlink:to="loc_us-gaap_DebtInstrumentAxis_019f7ece-1b19-7211-9065-3b76302cc79b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7211-9065-3b76302cc79b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019f7ece-1b19-7211-9065-3b76302cc79b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7211-9065-3b76302cc79b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019f7ece-1b19-7211-9065-3b76302cc79b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_SeniorNotesDueMarch2034Member_019f7ece-1b19-7001-a4aa-eeda4fc19b75" xlink:href="cnx-20260630.xsd#cnx_SeniorNotesDueMarch2034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:to="loc_cnx_SeniorNotesDueMarch2034Member_019f7ece-1b19-7001-a4aa-eeda4fc19b75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_SeniorNotesDueJanuary2029Member_019f7ece-1b19-771a-825a-5159ce375c6c" xlink:href="cnx-20260630.xsd#cnx_SeniorNotesDueJanuary2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:to="loc_cnx_SeniorNotesDueJanuary2029Member_019f7ece-1b19-771a-825a-5159ce375c6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_Convertible225SeniorNotesDue2026Member_019f7ece-1b19-7994-b7bc-3d35d035c979" xlink:href="cnx-20260630.xsd#cnx_Convertible225SeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:to="loc_cnx_Convertible225SeniorNotesDue2026Member_019f7ece-1b19-7994-b7bc-3d35d035c979" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_Convertible225SeniorNotesDue2026AdditionalOptionToInitialPurchasersMember_019f7ece-1b19-7c3b-b003-979358a9e859" xlink:href="cnx-20260630.xsd#cnx_Convertible225SeniorNotesDue2026AdditionalOptionToInitialPurchasersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:to="loc_cnx_Convertible225SeniorNotesDue2026AdditionalOptionToInitialPurchasersMember_019f7ece-1b19-7c3b-b003-979358a9e859" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_NewNotesConvertible7.25SeniorNotesDue2032Member_019f7ece-591f-7fb5-ad5e-b34e3846060e" xlink:href="cnx-20260630.xsd#cnx_NewNotesConvertible7.25SeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:to="loc_cnx_NewNotesConvertible7.25SeniorNotesDue2032Member_019f7ece-591f-7fb5-ad5e-b34e3846060e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_Convertible7.25SeniorNotesDue2032Member_019f7ece-591f-7cdf-88ec-67e1a496ee80" xlink:href="cnx-20260630.xsd#cnx_Convertible7.25SeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:to="loc_cnx_Convertible7.25SeniorNotesDue2032Member_019f7ece-591f-7cdf-88ec-67e1a496ee80" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_InitialNotesConvertible7.25SeniorNotesDue2032Member_019f7ece-591f-7c03-b946-5cda770b80c8" xlink:href="cnx-20260630.xsd#cnx_InitialNotesConvertible7.25SeniorNotesDue2032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019f7ece-1b19-7eee-8d41-99af347986d0" xlink:to="loc_cnx_InitialNotesConvertible7.25SeniorNotesDue2032Member_019f7ece-591f-7c03-b946-5cda770b80c8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019f7ece-1b19-773b-9c71-bbba201e8c78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019f7ece-1b19-7be7-90b4-5afa84123a39" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019f7ece-1b19-773b-9c71-bbba201e8c78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019f7ece-1b19-773b-9c71-bbba201e8c78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019f7ece-1b19-773b-9c71-bbba201e8c78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019f7ece-1b19-773b-9c71-bbba201e8c78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019f7ece-1b19-7764-9fae-5d1eafa4f5c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019f7ece-1b19-773b-9c71-bbba201e8c78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019f7ece-1b19-7764-9fae-5d1eafa4f5c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019f7ece-1b19-7b6b-ae74-9135c7bf400e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019f7ece-1b19-7764-9fae-5d1eafa4f5c9" xlink:to="loc_us-gaap_ConvertibleDebtMember_019f7ece-1b19-7b6b-ae74-9135c7bf400e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019f7ece-1b19-78dc-975d-efb5368d6705" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019f7ece-1b19-7be7-90b4-5afa84123a39" xlink:to="loc_srt_RangeAxis_019f7ece-1b19-78dc-975d-efb5368d6705" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019f7ece-1b19-78dc-975d-efb5368d6705_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019f7ece-1b19-78dc-975d-efb5368d6705" xlink:to="loc_srt_RangeMember_019f7ece-1b19-78dc-975d-efb5368d6705_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019f7ece-1b19-7527-8334-32c05f9789a9" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019f7ece-1b19-78dc-975d-efb5368d6705" xlink:to="loc_srt_RangeMember_019f7ece-1b19-7527-8334-32c05f9789a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019f7ece-1b19-7e50-a67c-6155a31460da" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019f7ece-1b19-7527-8334-32c05f9789a9" xlink:to="loc_srt_MinimumMember_019f7ece-1b19-7e50-a67c-6155a31460da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityTypeAxis_019f7ece-1b19-72a3-b78a-7a45dac6425e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OptionIndexedToIssuersEquityTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019f7ece-1b19-7be7-90b4-5afa84123a39" xlink:to="loc_us-gaap_OptionIndexedToIssuersEquityTypeAxis_019f7ece-1b19-72a3-b78a-7a45dac6425e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_019f7ece-1b19-72a3-b78a-7a45dac6425e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OptionIndexedToIssuersEquityTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OptionIndexedToIssuersEquityTypeAxis_019f7ece-1b19-72a3-b78a-7a45dac6425e" xlink:to="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_019f7ece-1b19-72a3-b78a-7a45dac6425e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_019f7ece-1b19-7926-afb0-52c67b4d5e24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OptionIndexedToIssuersEquityTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OptionIndexedToIssuersEquityTypeAxis_019f7ece-1b19-72a3-b78a-7a45dac6425e" xlink:to="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_019f7ece-1b19-7926-afb0-52c67b4d5e24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CallOptionMember_019f7ece-1b19-788b-91ab-09e1b497a06a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CallOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_019f7ece-1b19-7926-afb0-52c67b4d5e24" xlink:to="loc_us-gaap_CallOptionMember_019f7ece-1b19-788b-91ab-09e1b497a06a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019f7ece-1b19-714b-956e-cb0fe39d9dcc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019f7ece-1b19-7be7-90b4-5afa84123a39" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019f7ece-1b19-714b-956e-cb0fe39d9dcc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f7ece-1b19-714b-956e-cb0fe39d9dcc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019f7ece-1b19-714b-956e-cb0fe39d9dcc" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f7ece-1b19-714b-956e-cb0fe39d9dcc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f7ece-1b19-7151-b623-5bee8b544809" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019f7ece-1b19-714b-956e-cb0fe39d9dcc" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f7ece-1b19-7151-b623-5bee8b544809" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CappedCallTransactionMember_019f7ece-1b19-72e8-af52-d5ad23e58504" xlink:href="cnx-20260630.xsd#cnx_CappedCallTransactionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019f7ece-1b19-7151-b623-5bee8b544809" xlink:to="loc_cnx_CappedCallTransactionMember_019f7ece-1b19-72e8-af52-d5ad23e58504" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019f7ece-591f-7ed9-a90a-2c4404cf7090" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019f7ece-1b19-7be7-90b4-5afa84123a39" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019f7ece-591f-7ed9-a90a-2c4404cf7090" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f7ece-591f-7ed9-a90a-2c4404cf7090_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f7ece-591f-7ed9-a90a-2c4404cf7090" xlink:to="loc_us-gaap_ClassOfStockDomain_019f7ece-591f-7ed9-a90a-2c4404cf7090_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019f7ece-591f-7fd7-b990-7c64f8ac3e72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019f7ece-591f-7ed9-a90a-2c4404cf7090" xlink:to="loc_us-gaap_ClassOfStockDomain_019f7ece-591f-7fd7-b990-7c64f8ac3e72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019f7ece-591f-7685-8bd7-69ad395bd580" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019f7ece-591f-7fd7-b990-7c64f8ac3e72" xlink:to="loc_us-gaap_CommonStockMember_019f7ece-591f-7685-8bd7-69ad395bd580" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019f7ece-1b19-76c4-9150-054b08e9c4d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_LongTermDebt_019f7ece-1b19-76c4-9150-054b08e9c4d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019f7ece-1b19-7492-95ef-958b63ebbd81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019f7ece-1b19-7492-95ef-958b63ebbd81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DebtInstrumentPricePercentageOfPar_019f7ece-1b19-73ba-8b1a-a3d117229d3f" xlink:href="cnx-20260630.xsd#cnx_DebtInstrumentPricePercentageOfPar"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_cnx_DebtInstrumentPricePercentageOfPar_019f7ece-1b19-73ba-8b1a-a3d117229d3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019f7ece-1b19-7c9b-a650-d64d049ad7ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019f7ece-1b19-7c9b-a650-d64d049ad7ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019f7ece-1b19-7385-9c42-6dace36dbd82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019f7ece-1b19-7385-9c42-6dace36dbd82" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019f7ece-1b19-7aeb-b930-077ea3ee30d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019f7ece-1b19-7aeb-b930-077ea3ee30d8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromConvertibleDebt_019f7ece-1b19-726e-9d64-36403807d755" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_ProceedsFromConvertibleDebt_019f7ece-1b19-726e-9d64-36403807d755" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractIndexedToIssuersEquityForwardRate_019f7ece-1b19-7faf-adb4-6c7439245a8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForwardContractIndexedToIssuersEquityForwardRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_ForwardContractIndexedToIssuersEquityForwardRate_019f7ece-1b19-7faf-adb4-6c7439245a8a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019f7ece-591f-7a08-bd5c-10729cd33fef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019f7ece-591f-7a08-bd5c-10729cd33fef" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_019f7ece-591f-73a6-91ff-d9fc48ca726e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_019f7ece-591f-73a6-91ff-d9fc48ca726e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DebtInstrumentConvertibleCashConsiderationForConversion_019f7ece-591f-785a-86d6-100d4ea258e0" xlink:href="cnx-20260630.xsd#cnx_DebtInstrumentConvertibleCashConsiderationForConversion"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_cnx_DebtInstrumentConvertibleCashConsiderationForConversion_019f7ece-591f-785a-86d6-100d4ea258e0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019f8f7e-27fc-79cb-9ed7-76f2fae78bd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_019f8f7e-27fc-79cb-9ed7-76f2fae78bd7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019f7ece-591f-7297-ad3d-501bf8cf6a46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019f7ece-1b19-7e61-ab1e-6512ad02dce4" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_019f7ece-591f-7297-ad3d-501bf8cf6a46" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/LONGTERMDEBTScheduleofConvertibleDebtDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#LONGTERMDEBTScheduleofConvertibleDebtDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/LONGTERMDEBTScheduleofConvertibleDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7113-9f1e-1a15582f9973" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-718f-81d2-2ed5eb0b8d77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7113-9f1e-1a15582f9973" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-718f-81d2-2ed5eb0b8d77" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7648-b6f9-010e94569858" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-718f-81d2-2ed5eb0b8d77" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7648-b6f9-010e94569858" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-7648-b6f9-010e94569858_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7648-b6f9-010e94569858" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-7648-b6f9-010e94569858_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-791a-9ee5-0834884192e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7648-b6f9-010e94569858" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-791a-9ee5-0834884192e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_Convertible225SeniorNotesDue2026Member_019e2298-adcb-7098-b7b7-5e327d2861a1" xlink:href="cnx-20260630.xsd#cnx_Convertible225SeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-791a-9ee5-0834884192e6" xlink:to="loc_cnx_Convertible225SeniorNotesDue2026Member_019e2298-adcb-7098-b7b7-5e327d2861a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-74d9-b280-d49dcaa597e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-718f-81d2-2ed5eb0b8d77" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-74d9-b280-d49dcaa597e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-74d9-b280-d49dcaa597e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-74d9-b280-d49dcaa597e6" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-74d9-b280-d49dcaa597e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7f43-ab87-432c5b3f8e26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-74d9-b280-d49dcaa597e6" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7f43-ab87-432c5b3f8e26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019e2298-adcb-7df6-a794-604800f44c9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7f43-ab87-432c5b3f8e26" xlink:to="loc_us-gaap_ConvertibleDebtMember_019e2298-adcb-7df6-a794-604800f44c9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DebtInstrumentLiabilityComponentAbstract_019e2298-adcb-790e-8850-8db2f814f2f9" xlink:href="cnx-20260630.xsd#cnx_DebtInstrumentLiabilityComponentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7113-9f1e-1a15582f9973" xlink:to="loc_cnx_DebtInstrumentLiabilityComponentAbstract_019e2298-adcb-790e-8850-8db2f814f2f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e2298-adcb-72b7-85b6-fe358bd38f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cnx_DebtInstrumentLiabilityComponentAbstract_019e2298-adcb-790e-8850-8db2f814f2f9" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e2298-adcb-72b7-85b6-fe358bd38f6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_019e2298-adcb-7870-8621-e0b6791fb6ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cnx_DebtInstrumentLiabilityComponentAbstract_019e2298-adcb-790e-8850-8db2f814f2f9" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_019e2298-adcb-7870-8621-e0b6791fb6ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e2298-adcb-7416-9aba-6545f03b97b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7113-9f1e-1a15582f9973" xlink:to="loc_us-gaap_LongTermDebt_019e2298-adcb-7416-9aba-6545f03b97b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019e2298-adcb-71c0-b027-1fc154d4c952" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7113-9f1e-1a15582f9973" xlink:to="loc_us-gaap_LongTermDebtFairValue_019e2298-adcb-71c0-b027-1fc154d4c952" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/LONGTERMDEBTScheduleofInterestDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#LONGTERMDEBTScheduleofInterestDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/LONGTERMDEBTScheduleofInterestDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7843-bd6b-d353017d81f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-71f9-b36b-0912631b6259" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7843-bd6b-d353017d81f3" xlink:to="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-71f9-b36b-0912631b6259" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7991-a927-0b2b2b348714" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-71f9-b36b-0912631b6259" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7991-a927-0b2b2b348714" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7991-a927-0b2b2b348714_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7991-a927-0b2b2b348714" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-7991-a927-0b2b2b348714_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-74e9-b774-cdcf40e6d676" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e2298-adcb-7991-a927-0b2b2b348714" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-74e9-b774-cdcf40e6d676" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_019e2298-adcb-7399-bbb3-fd08371f70fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e2298-adcb-74e9-b774-cdcf40e6d676" xlink:to="loc_us-gaap_ConvertibleDebtMember_019e2298-adcb-7399-bbb3-fd08371f70fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7f78-9928-e27b6acfcf9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e2298-adcb-71f9-b36b-0912631b6259" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7f78-9928-e27b6acfcf9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-7f78-9928-e27b6acfcf9d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7f78-9928-e27b6acfcf9d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-7f78-9928-e27b6acfcf9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70af-9d72-3b1e69a16070" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e2298-adcb-7f78-9928-e27b6acfcf9d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70af-9d72-3b1e69a16070" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_Convertible225SeniorNotesDue2026Member_019e2298-adcb-7d4e-a4e3-7a282af04842" xlink:href="cnx-20260630.xsd#cnx_Convertible225SeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e2298-adcb-70af-9d72-3b1e69a16070" xlink:to="loc_cnx_Convertible225SeniorNotesDue2026Member_019e2298-adcb-7d4e-a4e3-7a282af04842" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019e2298-adcb-7846-ae88-ab88be4aa35d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebtExcludingAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7843-bd6b-d353017d81f3" xlink:to="loc_us-gaap_InterestExpenseDebtExcludingAmortization_019e2298-adcb-7846-ae88-ab88be4aa35d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_019e2298-adcb-71b9-807f-7a6d7a8d5629" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7843-bd6b-d353017d81f3" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_019e2298-adcb-71b9-807f-7a6d7a8d5629" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019e2298-adcb-7ee6-a175-336bb7eae27f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e2298-adcb-7843-bd6b-d353017d81f3" xlink:to="loc_us-gaap_InterestExpenseDebt_019e2298-adcb-7ee6-a175-336bb7eae27f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/COMMITMENTSANDCONTINGENTLIABILITIESNarrativeDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#COMMITMENTSANDCONTINGENTLIABILITIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/COMMITMENTSANDCONTINGENTLIABILITIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019e2298-adcb-79b6-9852-5e0c30d7ee74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019e2298-adcb-7d64-8505-2866f55f9368" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e2298-adcb-79b6-9852-5e0c30d7ee74" xlink:to="loc_us-gaap_LossContingenciesTable_019e2298-adcb-7d64-8505-2866f55f9368" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e2298-adcb-73af-8c56-9e5bca34fd90" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019e2298-adcb-7d64-8505-2866f55f9368" xlink:to="loc_dei_LegalEntityAxis_019e2298-adcb-73af-8c56-9e5bca34fd90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e2298-adcb-73af-8c56-9e5bca34fd90_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e2298-adcb-73af-8c56-9e5bca34fd90" xlink:to="loc_dei_EntityDomain_019e2298-adcb-73af-8c56-9e5bca34fd90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e2298-adcb-7f9f-86a5-e0a09c7dfe60" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e2298-adcb-73af-8c56-9e5bca34fd90" xlink:to="loc_dei_EntityDomain_019e2298-adcb-7f9f-86a5-e0a09c7dfe60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_MurrayEnergyCorporationMember_019e2298-adcb-79b8-b824-a754aef1cd1e" xlink:href="cnx-20260630.xsd#cnx_MurrayEnergyCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e2298-adcb-7f9f-86a5-e0a09c7dfe60" xlink:to="loc_cnx_MurrayEnergyCorporationMember_019e2298-adcb-79b8-b824-a754aef1cd1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_019e2298-adcb-78ca-900f-0db1bc941fd5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019e2298-adcb-7d64-8505-2866f55f9368" xlink:to="loc_srt_LitigationCaseAxis_019e2298-adcb-78ca-900f-0db1bc941fd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019e2298-adcb-78ca-900f-0db1bc941fd5_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_019e2298-adcb-78ca-900f-0db1bc941fd5" xlink:to="loc_srt_LitigationCaseTypeDomain_019e2298-adcb-78ca-900f-0db1bc941fd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019e2298-adcb-7184-a19e-17f281609bca" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_019e2298-adcb-78ca-900f-0db1bc941fd5" xlink:to="loc_srt_LitigationCaseTypeDomain_019e2298-adcb-7184-a19e-17f281609bca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_SettlementAgreementBetweenMurrayAndUMWAMember_019e2298-adcb-7dfb-ab29-532762adf785" xlink:href="cnx-20260630.xsd#cnx_SettlementAgreementBetweenMurrayAndUMWAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019e2298-adcb-7184-a19e-17f281609bca" xlink:to="loc_cnx_SettlementAgreementBetweenMurrayAndUMWAMember_019e2298-adcb-7dfb-ab29-532762adf785" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_NumberOfRetiredEmployees_019e2298-adcb-7c6d-837a-6392cc748afc" xlink:href="cnx-20260630.xsd#cnx_NumberOfRetiredEmployees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e2298-adcb-79b6-9852-5e0c30d7ee74" xlink:to="loc_cnx_NumberOfRetiredEmployees_019e2298-adcb-7c6d-837a-6392cc748afc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_019e2298-adcb-7297-8f90-2a5d9c80263d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e2298-adcb-79b6-9852-5e0c30d7ee74" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_019e2298-adcb-7297-8f90-2a5d9c80263d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_LossContingencyPeriodPayable_019e2298-adcb-7d6b-a57b-6126c1b205f2" xlink:href="cnx-20260630.xsd#cnx_LossContingencyPeriodPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e2298-adcb-79b6-9852-5e0c30d7ee74" xlink:to="loc_cnx_LossContingencyPeriodPayable_019e2298-adcb-7d6b-a57b-6126c1b205f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualCarryingValueNoncurrent_019e2298-adcb-70f5-bbf4-eaafa2469411" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyAccrualCarryingValueNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e2298-adcb-79b6-9852-5e0c30d7ee74" xlink:to="loc_us-gaap_LossContingencyAccrualCarryingValueNoncurrent_019e2298-adcb-70f5-bbf4-eaafa2469411" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/COMMITMENTSANDCONTINGENTLIABILITIESScheduleofAmountofCommitmentExpirationPerPeriodDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#COMMITMENTSANDCONTINGENTLIABILITIESScheduleofAmountofCommitmentExpirationPerPeriodDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/COMMITMENTSANDCONTINGENTLIABILITIESScheduleofAmountofCommitmentExpirationPerPeriodDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cnx_ScheduleOfCostsRelatedToPurchaseObligationsLineItems_019e2298-adcb-7ab8-bb46-71189babea08" xlink:href="cnx-20260630.xsd#cnx_ScheduleOfCostsRelatedToPurchaseObligationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_ScheduleOfCostsRelatedToPurchaseObligationsTable_019e2298-adcb-73b6-956b-e9ed3091a3cc" xlink:href="cnx-20260630.xsd#cnx_ScheduleOfCostsRelatedToPurchaseObligationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cnx_ScheduleOfCostsRelatedToPurchaseObligationsLineItems_019e2298-adcb-7ab8-bb46-71189babea08" xlink:to="loc_cnx_ScheduleOfCostsRelatedToPurchaseObligationsTable_019e2298-adcb-73b6-956b-e9ed3091a3cc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e2298-adcb-79f9-ad46-501125c62215" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cnx_ScheduleOfCostsRelatedToPurchaseObligationsTable_019e2298-adcb-73b6-956b-e9ed3091a3cc" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e2298-adcb-79f9-ad46-501125c62215" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019e2298-adcb-79f9-ad46-501125c62215_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e2298-adcb-79f9-ad46-501125c62215" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019e2298-adcb-79f9-ad46-501125c62215_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019e2298-adcb-7c6f-b2e2-1f5d534c6324" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e2298-adcb-79f9-ad46-501125c62215" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019e2298-adcb-7c6f-b2e2-1f5d534c6324" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_019e2298-adcb-73ec-bfc6-c2a826a8fb87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019e2298-adcb-7c6f-b2e2-1f5d534c6324" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_019e2298-adcb-73ec-bfc6-c2a826a8fb87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SuretyBondMember_019e2298-adcb-739c-acf3-5fbd5b841b80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SuretyBondMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019e2298-adcb-7c6f-b2e2-1f5d534c6324" xlink:to="loc_us-gaap_SuretyBondMember_019e2298-adcb-739c-acf3-5fbd5b841b80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMember_019e2298-adcb-706e-928c-2d1725d3ef29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019e2298-adcb-7c6f-b2e2-1f5d534c6324" xlink:to="loc_us-gaap_GuaranteeObligationsMember_019e2298-adcb-706e-928c-2d1725d3ef29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019e2298-adcb-75f5-b13d-a3fc281a7ed3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cnx_ScheduleOfCostsRelatedToPurchaseObligationsTable_019e2298-adcb-73b6-956b-e9ed3091a3cc" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019e2298-adcb-75f5-b13d-a3fc281a7ed3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-75f5-b13d-a3fc281a7ed3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019e2298-adcb-75f5-b13d-a3fc281a7ed3" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-75f5-b13d-a3fc281a7ed3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-7a3c-a97b-70ab589f5fa0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019e2298-adcb-75f5-b13d-a3fc281a7ed3" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-7a3c-a97b-70ab589f5fa0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_BalanceOnFirstAnniversaryMember_019e2298-adcb-769a-a0ef-e854e11b007e" xlink:href="cnx-20260630.xsd#cnx_BalanceOnFirstAnniversaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-7a3c-a97b-70ab589f5fa0" xlink:to="loc_cnx_BalanceOnFirstAnniversaryMember_019e2298-adcb-769a-a0ef-e854e11b007e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMember_019e2298-adcb-77c5-9868-011b101d6a75" xlink:href="cnx-20260630.xsd#cnx_MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-7a3c-a97b-70ab589f5fa0" xlink:to="loc_cnx_MoreThanOneAndWithinThreeYearsFromBalanceSheetDateMember_019e2298-adcb-77c5-9868-011b101d6a75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMember_019e2298-adcb-7eb2-87d2-61e3f73a4700" xlink:href="cnx-20260630.xsd#cnx_MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-7a3c-a97b-70ab589f5fa0" xlink:to="loc_cnx_MoreThanThreeAndWithinFiveYearsFromBalanceSheetDateMember_019e2298-adcb-7eb2-87d2-61e3f73a4700" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_BeyondFiveYearsOfBalanceSheetDateMember_019e2298-adcb-7955-86f9-4851377d2a3a" xlink:href="cnx-20260630.xsd#cnx_BeyondFiveYearsOfBalanceSheetDateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-7a3c-a97b-70ab589f5fa0" xlink:to="loc_cnx_BeyondFiveYearsOfBalanceSheetDateMember_019e2298-adcb-7955-86f9-4851377d2a3a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_IndefiniteFromBalanceSheetDateMember_019e2298-adcb-7532-9c67-08a4bc49865d" xlink:href="cnx-20260630.xsd#cnx_IndefiniteFromBalanceSheetDateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e2298-adcb-7a3c-a97b-70ab589f5fa0" xlink:to="loc_cnx_IndefiniteFromBalanceSheetDateMember_019e2298-adcb-7532-9c67-08a4bc49865d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019e2298-adcb-72cf-8da7-e1a7b9e87278" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cnx_ScheduleOfCostsRelatedToPurchaseObligationsTable_019e2298-adcb-73b6-956b-e9ed3091a3cc" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019e2298-adcb-72cf-8da7-e1a7b9e87278" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-72cf-8da7-e1a7b9e87278_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019e2298-adcb-72cf-8da7-e1a7b9e87278" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-72cf-8da7-e1a7b9e87278_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-7464-bfd2-514865716047" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019e2298-adcb-72cf-8da7-e1a7b9e87278" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-7464-bfd2-514865716047" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_FirmTransportationMember_019e2298-adcb-7da6-bf08-6f28d06ccd39" xlink:href="cnx-20260630.xsd#cnx_FirmTransportationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-7464-bfd2-514865716047" xlink:to="loc_cnx_FirmTransportationMember_019e2298-adcb-7da6-bf08-6f28d06ccd39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_OtherCommitmentsMember_019e2298-adcb-7637-98fc-5753fb231a82" xlink:href="cnx-20260630.xsd#cnx_OtherCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-7464-bfd2-514865716047" xlink:to="loc_cnx_OtherCommitmentsMember_019e2298-adcb-7637-98fc-5753fb231a82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_EmployeeRelatedCommitmentsMember_019e2298-adcb-79c4-a226-a508751bea3e" xlink:href="cnx-20260630.xsd#cnx_EmployeeRelatedCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-7464-bfd2-514865716047" xlink:to="loc_cnx_EmployeeRelatedCommitmentsMember_019e2298-adcb-79c4-a226-a508751bea3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_EnvironmentRelatedCommitmentsMember_019e2298-adcb-7ff8-aee0-95e1a0a15c80" xlink:href="cnx-20260630.xsd#cnx_EnvironmentRelatedCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-7464-bfd2-514865716047" xlink:to="loc_cnx_EnvironmentRelatedCommitmentsMember_019e2298-adcb-7ff8-aee0-95e1a0a15c80" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialGuaranteeMember_019e2298-adcb-74e0-9098-6353465b34c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-7464-bfd2-514865716047" xlink:to="loc_us-gaap_FinancialGuaranteeMember_019e2298-adcb-74e0-9098-6353465b34c4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_LossContingenciesbySecondaryNatureofContingencyMember_019e2298-adcb-7239-a445-cfb6d88129c7" xlink:href="cnx-20260630.xsd#cnx_LossContingenciesbySecondaryNatureofContingencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019e2298-adcb-7464-bfd2-514865716047" xlink:to="loc_cnx_LossContingenciesbySecondaryNatureofContingencyMember_019e2298-adcb-7239-a445-cfb6d88129c7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_019e2298-adcb-7f47-8a8b-3a41eb4bddc1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cnx_ScheduleOfCostsRelatedToPurchaseObligationsLineItems_019e2298-adcb-7ab8-bb46-71189babea08" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_019e2298-adcb-7f47-8a8b-3a41eb4bddc1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/COMMITMENTSANDCONTINGENTLIABILITIESScheduleofUnrecordedUnconditionalPurchaseObligationDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#COMMITMENTSANDCONTINGENTLIABILITIESScheduleofUnrecordedUnconditionalPurchaseObligationDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/COMMITMENTSANDCONTINGENTLIABILITIESScheduleofUnrecordedUnconditionalPurchaseObligationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_019e2298-adcb-753b-ba47-0bf64ec343ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationTable_019e2298-adcb-7ebf-8754-aa4b9e3b8813" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_019e2298-adcb-753b-ba47-0bf64ec343ee" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationTable_019e2298-adcb-7ebf-8754-aa4b9e3b8813" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019e2298-adcb-75e2-b291-d875557e8339" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationTable_019e2298-adcb-7ebf-8754-aa4b9e3b8813" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019e2298-adcb-75e2-b291-d875557e8339" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e2298-adcb-75e2-b291-d875557e8339_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019e2298-adcb-75e2-b291-d875557e8339" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e2298-adcb-75e2-b291-d875557e8339_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e2298-adcb-7ba8-ac77-569aff00c627" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis_019e2298-adcb-75e2-b291-d875557e8339" xlink:to="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e2298-adcb-7ba8-ac77-569aff00c627" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentMember_019e2298-adcb-7e61-806a-267dfe5df7e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnconditionalPurchaseObligationCategoryOfGoodsOrServicesAcquiredDomain_019e2298-adcb-7ba8-ac77-569aff00c627" xlink:to="loc_us-gaap_PurchaseCommitmentMember_019e2298-adcb-7e61-806a-267dfe5df7e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary_019e2298-adcb-7fb1-a945-e86eeddacd76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_019e2298-adcb-753b-ba47-0bf64ec343ee" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary_019e2298-adcb-7fb1-a945-e86eeddacd76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary_019e2298-adcb-7c41-ba02-bd479aadde20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_019e2298-adcb-753b-ba47-0bf64ec343ee" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary_019e2298-adcb-7c41-ba02-bd479aadde20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary_019e2298-adcb-7625-add1-a6e5485d3e89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_019e2298-adcb-753b-ba47-0bf64ec343ee" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary_019e2298-adcb-7625-add1-a6e5485d3e89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears_019e2298-adcb-7f65-b62b-7daa6157ac75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_019e2298-adcb-753b-ba47-0bf64ec343ee" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears_019e2298-adcb-7f65-b62b-7daa6157ac75" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019e2298-adcb-7ea7-92fc-8bca5d9ab211" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems_019e2298-adcb-753b-ba47-0bf64ec343ee" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount_019e2298-adcb-7ea7-92fc-8bca5d9ab211" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/DERIVATIVEINSTRUMENTSScheduleofNotionalAmountsofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#DERIVATIVEINSTRUMENTSScheduleofNotionalAmountsofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/DERIVATIVEINSTRUMENTSScheduleofNotionalAmountsofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c1f-809b-7a0e467295f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019e2298-adcb-7c8b-9b98-00712f4f3c86" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c1f-809b-7a0e467295f6" xlink:to="loc_us-gaap_DerivativeTable_019e2298-adcb-7c8b-9b98-00712f4f3c86" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-7254-9196-e002a6aa1880" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e2298-adcb-7c8b-9b98-00712f4f3c86" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-7254-9196-e002a6aa1880" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7254-9196-e002a6aa1880_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-7254-9196-e002a6aa1880" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7254-9196-e002a6aa1880_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7ea6-abc7-18d1e7a56d51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-7254-9196-e002a6aa1880" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7ea6-abc7-18d1e7a56d51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e2298-adcb-7e41-8963-0432f53a7696" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7ea6-abc7-18d1e7a56d51" xlink:to="loc_us-gaap_CommodityContractMember_019e2298-adcb-7e41-8963-0432f53a7696" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisSwapMember_019e2298-adcb-77ff-a81d-7c85d57c4ddf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BasisSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7ea6-abc7-18d1e7a56d51" xlink:to="loc_us-gaap_BasisSwapMember_019e2298-adcb-77ff-a81d-7c85d57c4ddf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyAxis_019e2298-adcb-7ca5-bde6-05be5839d21a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e2298-adcb-7c8b-9b98-00712f4f3c86" xlink:to="loc_srt_EnergyAxis_019e2298-adcb-7ca5-bde6-05be5839d21a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_019e2298-adcb-7ca5-bde6-05be5839d21a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_EnergyAxis_019e2298-adcb-7ca5-bde6-05be5839d21a" xlink:to="loc_srt_EnergyDomain_019e2298-adcb-7ca5-bde6-05be5839d21a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_019e2298-adcb-7e8f-a869-476f2ccc1bb7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_EnergyAxis_019e2298-adcb-7ca5-bde6-05be5839d21a" xlink:to="loc_srt_EnergyDomain_019e2298-adcb-7e8f-a869-476f2ccc1bb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasReservesMember_019e2298-adcb-75e2-acd4-a39947f163cf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NaturalGasReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e2298-adcb-7e8f-a869-476f2ccc1bb7" xlink:to="loc_srt_NaturalGasReservesMember_019e2298-adcb-75e2-acd4-a39947f163cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasLiquidsReservesMember_019e2298-adcb-7918-a020-4adfc7ec4f04" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NaturalGasLiquidsReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e2298-adcb-7e8f-a869-476f2ccc1bb7" xlink:to="loc_srt_NaturalGasLiquidsReservesMember_019e2298-adcb-7918-a020-4adfc7ec4f04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_019e2298-adcb-7f80-bc0c-83a122f80213" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountVolume"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c1f-809b-7a0e467295f6" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_019e2298-adcb-7f80-bc0c-83a122f80213" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/DERIVATIVEINSTRUMENTSScheduleofFairValueofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#DERIVATIVEINSTRUMENTSScheduleofFairValueofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/DERIVATIVEINSTRUMENTSScheduleofFairValueofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c9a-85d7-b33ac1cdeca5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019e2298-adcb-71a7-b627-e7df46ab5804" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c9a-85d7-b33ac1cdeca5" xlink:to="loc_us-gaap_DerivativeTable_019e2298-adcb-71a7-b627-e7df46ab5804" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-77f5-9bf7-ff2afb172a80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e2298-adcb-71a7-b627-e7df46ab5804" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-77f5-9bf7-ff2afb172a80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-77f5-9bf7-ff2afb172a80_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-77f5-9bf7-ff2afb172a80" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-77f5-9bf7-ff2afb172a80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7321-aa31-01625943599b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-77f5-9bf7-ff2afb172a80" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7321-aa31-01625943599b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e2298-adcb-79d7-b0cb-66041fbcd154" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7321-aa31-01625943599b" xlink:to="loc_us-gaap_CommodityContractMember_019e2298-adcb-79d7-b0cb-66041fbcd154" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisSwapMember_019e2298-adcb-740c-8b3e-baf62c238b9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BasisSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7321-aa31-01625943599b" xlink:to="loc_us-gaap_BasisSwapMember_019e2298-adcb-740c-8b3e-baf62c238b9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyAxis_019e2298-adcb-7b18-860c-a86a3d7cf63c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e2298-adcb-71a7-b627-e7df46ab5804" xlink:to="loc_srt_EnergyAxis_019e2298-adcb-7b18-860c-a86a3d7cf63c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_019e2298-adcb-7b18-860c-a86a3d7cf63c_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_EnergyAxis_019e2298-adcb-7b18-860c-a86a3d7cf63c" xlink:to="loc_srt_EnergyDomain_019e2298-adcb-7b18-860c-a86a3d7cf63c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_019e2298-adcb-77e1-92f9-27585ff7c0ac" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_EnergyAxis_019e2298-adcb-7b18-860c-a86a3d7cf63c" xlink:to="loc_srt_EnergyDomain_019e2298-adcb-77e1-92f9-27585ff7c0ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasReservesMember_019e2298-adcb-7e09-8e2c-efd851757105" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NaturalGasReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e2298-adcb-77e1-92f9-27585ff7c0ac" xlink:to="loc_srt_NaturalGasReservesMember_019e2298-adcb-7e09-8e2c-efd851757105" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasLiquidsReservesMember_019e2298-adcb-7c5f-8b8e-87b34b1bcfdb" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NaturalGasLiquidsReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e2298-adcb-77e1-92f9-27585ff7c0ac" xlink:to="loc_srt_NaturalGasLiquidsReservesMember_019e2298-adcb-7c5f-8b8e-87b34b1bcfdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_019e2298-adcb-756d-85bb-961909d2476c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c9a-85d7-b33ac1cdeca5" xlink:to="loc_us-gaap_DerivativeAssetsCurrent_019e2298-adcb-756d-85bb-961909d2476c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_019e2298-adcb-7c6b-bd4b-7e083fe764a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c9a-85d7-b33ac1cdeca5" xlink:to="loc_us-gaap_DerivativeAssetsNoncurrent_019e2298-adcb-7c6b-bd4b-7e083fe764a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesCurrent_019e2298-adcb-7d5c-99bf-6aca046ed4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c9a-85d7-b33ac1cdeca5" xlink:to="loc_us-gaap_DerivativeLiabilitiesCurrent_019e2298-adcb-7d5c-99bf-6aca046ed4f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesNoncurrent_019e2298-adcb-74c4-80f0-82f67a162067" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-7c9a-85d7-b33ac1cdeca5" xlink:to="loc_us-gaap_DerivativeLiabilitiesNoncurrent_019e2298-adcb-74c4-80f0-82f67a162067" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/DERIVATIVEINSTRUMENTSScheduleofEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#DERIVATIVEINSTRUMENTSScheduleofEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/DERIVATIVEINSTRUMENTSScheduleofEffectofDerivativeInstrumentsontheConsolidatedStatementofIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e2298-adcb-746f-a3c4-091f3ba706c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019e2298-adcb-73eb-9d38-c1ab413c0c2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-746f-a3c4-091f3ba706c3" xlink:to="loc_us-gaap_DerivativeTable_019e2298-adcb-73eb-9d38-c1ab413c0c2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyAxis_019e2298-adcb-79f4-b5e5-09e0e834f994" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e2298-adcb-73eb-9d38-c1ab413c0c2a" xlink:to="loc_srt_EnergyAxis_019e2298-adcb-79f4-b5e5-09e0e834f994" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_019e2298-adcb-79f4-b5e5-09e0e834f994_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_EnergyAxis_019e2298-adcb-79f4-b5e5-09e0e834f994" xlink:to="loc_srt_EnergyDomain_019e2298-adcb-79f4-b5e5-09e0e834f994_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_019e2298-adcb-74da-8470-f8247d8b23c6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_EnergyAxis_019e2298-adcb-79f4-b5e5-09e0e834f994" xlink:to="loc_srt_EnergyDomain_019e2298-adcb-74da-8470-f8247d8b23c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasReservesMember_019e2298-adcb-7340-9137-7f7fbcf145be" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NaturalGasReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e2298-adcb-74da-8470-f8247d8b23c6" xlink:to="loc_srt_NaturalGasReservesMember_019e2298-adcb-7340-9137-7f7fbcf145be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasLiquidsReservesMember_019e2298-adcb-708c-ad15-1b79b4d1867b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NaturalGasLiquidsReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e2298-adcb-74da-8470-f8247d8b23c6" xlink:to="loc_srt_NaturalGasLiquidsReservesMember_019e2298-adcb-708c-ad15-1b79b4d1867b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-79ba-9047-54ed16178446" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e2298-adcb-73eb-9d38-c1ab413c0c2a" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-79ba-9047-54ed16178446" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-79ba-9047-54ed16178446_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-79ba-9047-54ed16178446" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-79ba-9047-54ed16178446_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7d46-86d0-fde192b7a403" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-79ba-9047-54ed16178446" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7d46-86d0-fde192b7a403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e2298-adcb-73ed-a74b-1ba1a95e4bde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7d46-86d0-fde192b7a403" xlink:to="loc_us-gaap_CommodityContractMember_019e2298-adcb-73ed-a74b-1ba1a95e4bde" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisSwapMember_019e2298-adcb-74f8-9eef-46204247fd0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BasisSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7d46-86d0-fde192b7a403" xlink:to="loc_us-gaap_BasisSwapMember_019e2298-adcb-74f8-9eef-46204247fd0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnergyRelatedDerivativeMember_019e2298-adcb-74c9-839f-b861261fe09d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnergyRelatedDerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7d46-86d0-fde192b7a403" xlink:to="loc_us-gaap_EnergyRelatedDerivativeMember_019e2298-adcb-74c9-839f-b861261fe09d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfCommodityContracts_019e2298-adcb-7e30-8aaf-2c2806458db9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfCommodityContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-746f-a3c4-091f3ba706c3" xlink:to="loc_us-gaap_GainLossOnSaleOfCommodityContracts_019e2298-adcb-7e30-8aaf-2c2806458db9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts_019e2298-adcb-7263-9c4b-98922de125c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-746f-a3c4-091f3ba706c3" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts_019e2298-adcb-7263-9c4b-98922de125c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-adcb-7a2d-9686-b48303ebd0f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnOilAndGasHedgingActivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-746f-a3c4-091f3ba706c3" xlink:to="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-adcb-7a2d-9686-b48303ebd0f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e2298-adcb-71e1-b453-7a4d5fc4e6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-746f-a3c4-091f3ba706c3" xlink:to="loc_us-gaap_DerivativeAssets_019e2298-adcb-71e1-b453-7a4d5fc4e6ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DerivativesSettledNotPaid_019e2298-adcb-7408-ad4c-6e3e629a4b6e" xlink:href="cnx-20260630.xsd#cnx_DerivativesSettledNotPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e2298-adcb-746f-a3c4-091f3ba706c3" xlink:to="loc_cnx_DerivativesSettledNotPaid_019e2298-adcb-7408-ad4c-6e3e629a4b6e" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueAssetsMeasuredonRecurringBasisDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueAssetsMeasuredonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueAssetsMeasuredonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2298-adcb-7da7-8df0-f41b005e472c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2298-adcb-7777-ac5b-cf4d2b4379f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2298-adcb-7da7-8df0-f41b005e472c" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2298-adcb-7777-ac5b-cf4d2b4379f1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2298-adcb-7eee-8b37-4fbe1cbd78ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2298-adcb-7777-ac5b-cf4d2b4379f1" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2298-adcb-7eee-8b37-4fbe1cbd78ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2298-adcb-7eee-8b37-4fbe1cbd78ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2298-adcb-7eee-8b37-4fbe1cbd78ae" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2298-adcb-7eee-8b37-4fbe1cbd78ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2298-adcb-79fd-8a81-7303024cd5b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e2298-adcb-7eee-8b37-4fbe1cbd78ae" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2298-adcb-79fd-8a81-7303024cd5b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e2298-adcb-7863-a9cd-7d03b3199d03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2298-adcb-79fd-8a81-7303024cd5b9" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e2298-adcb-7863-a9cd-7d03b3199d03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e2298-adcb-730e-85b9-ff597de4733a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2298-adcb-79fd-8a81-7303024cd5b9" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e2298-adcb-730e-85b9-ff597de4733a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e2298-adcb-7251-909c-d1456263227a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e2298-adcb-79fd-8a81-7303024cd5b9" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e2298-adcb-7251-909c-d1456263227a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-7052-ac22-3bffc7c25e17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e2298-adcb-7777-ac5b-cf4d2b4379f1" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-7052-ac22-3bffc7c25e17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7052-ac22-3bffc7c25e17_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-7052-ac22-3bffc7c25e17" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7052-ac22-3bffc7c25e17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7cd6-a29b-23db31a6d435" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e2298-adcb-7052-ac22-3bffc7c25e17" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7cd6-a29b-23db31a6d435" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e2298-adcb-7b71-8db4-b3ad432dfb40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e2298-adcb-7cd6-a29b-23db31a6d435" xlink:to="loc_us-gaap_CommodityContractMember_019e2298-adcb-7b71-8db4-b3ad432dfb40" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e2298-adcb-7b6f-81f7-9f6e9ba78633" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2298-adcb-7da7-8df0-f41b005e472c" xlink:to="loc_us-gaap_DerivativeAssets_019e2298-adcb-7b6f-81f7-9f6e9ba78633" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DerivativesSettledNotPaid_019e2298-adcb-714d-8e9d-0e50e9f5f9ac" xlink:href="cnx-20260630.xsd#cnx_DerivativesSettledNotPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e2298-adcb-7da7-8df0-f41b005e472c" xlink:to="loc_cnx_DerivativesSettledNotPaid_019e2298-adcb-714d-8e9d-0e50e9f5f9ac" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueAssetsandLiabilitiesMeasuredonNonrecurringBasisDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueAssetsandLiabilitiesMeasuredonNonrecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSScheduleofFairValueAssetsandLiabilitiesMeasuredonNonrecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e2298-adcb-7014-98b6-47851ae62e26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2298-adcb-7c7e-b193-c9e312917826" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e2298-adcb-7014-98b6-47851ae62e26" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2298-adcb-7c7e-b193-c9e312917826" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019e2298-adcb-75d7-b66e-8722154ae15c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e2298-adcb-7c7e-b193-c9e312917826" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019e2298-adcb-75d7-b66e-8722154ae15c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e2298-adcb-75d7-b66e-8722154ae15c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e2298-adcb-75d7-b66e-8722154ae15c" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e2298-adcb-75d7-b66e-8722154ae15c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e2298-adcb-74b0-bc77-306cf1973332" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e2298-adcb-75d7-b66e-8722154ae15c" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e2298-adcb-74b0-bc77-306cf1973332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e2298-adcb-72ea-b5d8-958d526d3c15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e2298-adcb-74b0-bc77-306cf1973332" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e2298-adcb-72ea-b5d8-958d526d3c15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e2298-adcb-7e17-8741-f22ca7ba562d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e2298-adcb-72ea-b5d8-958d526d3c15" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e2298-adcb-7e17-8741-f22ca7ba562d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e2298-adcb-7ff4-bd38-84bf5848a41c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e2298-adcb-72ea-b5d8-958d526d3c15" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e2298-adcb-7ff4-bd38-84bf5848a41c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e2298-adcb-7ef7-a220-f3a759bd85c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e2298-adcb-7014-98b6-47851ae62e26" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e2298-adcb-7ef7-a220-f3a759bd85c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019e2298-adcb-73a6-bcbf-f101111005d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e2298-adcb-7014-98b6-47851ae62e26" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_019e2298-adcb-73a6-bcbf-f101111005d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e2298-adcb-71c8-ab5a-08c9769efa67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e2298-adcb-7014-98b6-47851ae62e26" xlink:to="loc_us-gaap_LongTermDebt_019e2298-adcb-71c8-ab5a-08c9769efa67" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/SEGMENTINFORMATIONScheduleofIndustrySegmentResultsDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#SEGMENTINFORMATIONScheduleofIndustrySegmentResultsDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/SEGMENTINFORMATIONScheduleofIndustrySegmentResultsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2298-adcb-7930-80ff-4e94023db7b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2298-adcb-7930-80ff-4e94023db7b6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e2298-adcb-721f-8e89-df41bb91e9f3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2298-adcb-7930-80ff-4e94023db7b6" xlink:to="loc_srt_ConsolidationItemsAxis_019e2298-adcb-721f-8e89-df41bb91e9f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e2298-adcb-721f-8e89-df41bb91e9f3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e2298-adcb-721f-8e89-df41bb91e9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019e2298-adcb-721f-8e89-df41bb91e9f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e2298-adcb-7073-92db-d794f50a8aad" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e2298-adcb-721f-8e89-df41bb91e9f3" xlink:to="loc_srt_ConsolidationItemsDomain_019e2298-adcb-7073-92db-d794f50a8aad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e2298-adcb-7a52-b797-fe5a077d4aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e2298-adcb-7073-92db-d794f50a8aad" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e2298-adcb-7a52-b797-fe5a077d4aa8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019e2298-adcb-7d88-9d70-f44e21ab3ba1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e2298-adcb-7073-92db-d794f50a8aad" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019e2298-adcb-7d88-9d70-f44e21ab3ba1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e2298-adcb-7a8b-8cde-043c83da9766" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2298-adcb-7930-80ff-4e94023db7b6" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e2298-adcb-7a8b-8cde-043c83da9766" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e2298-adcb-7a8b-8cde-043c83da9766_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e2298-adcb-7a8b-8cde-043c83da9766" xlink:to="loc_us-gaap_SegmentDomain_019e2298-adcb-7a8b-8cde-043c83da9766_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e2298-adcb-7108-b1fb-6acbd8ac5403" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e2298-adcb-7a8b-8cde-043c83da9766" xlink:to="loc_us-gaap_SegmentDomain_019e2298-adcb-7108-b1fb-6acbd8ac5403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_ShaleMember_019e2298-adcb-766e-99d5-156c54c5b121" xlink:href="cnx-20260630.xsd#cnx_ShaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e2298-adcb-7108-b1fb-6acbd8ac5403" xlink:to="loc_cnx_ShaleMember_019e2298-adcb-766e-99d5-156c54c5b121" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CoalbedMethaneMember_019e2298-adcb-7e01-b794-733f5efa101f" xlink:href="cnx-20260630.xsd#cnx_CoalbedMethaneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e2298-adcb-7108-b1fb-6acbd8ac5403" xlink:to="loc_cnx_CoalbedMethaneMember_019e2298-adcb-7e01-b794-733f5efa101f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e2298-adcb-74b0-8328-cfa1e4cf5fb3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2298-adcb-7930-80ff-4e94023db7b6" xlink:to="loc_srt_ProductOrServiceAxis_019e2298-adcb-74b0-8328-cfa1e4cf5fb3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2298-adcb-74b0-8328-cfa1e4cf5fb3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e2298-adcb-74b0-8328-cfa1e4cf5fb3" xlink:to="loc_srt_ProductsAndServicesDomain_019e2298-adcb-74b0-8328-cfa1e4cf5fb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e2298-adcb-79fe-b419-a45f72f11510" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e2298-adcb-74b0-8328-cfa1e4cf5fb3" xlink:to="loc_srt_ProductsAndServicesDomain_019e2298-adcb-79fe-b419-a45f72f11510" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OilAndGasMember_019e2298-adcb-7fb4-a5e6-edd0ce299abe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OilAndGasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-adcb-79fe-b419-a45f72f11510" xlink:to="loc_us-gaap_OilAndGasMember_019e2298-adcb-7fb4-a5e6-edd0ce299abe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OilAndGasPurchasedMember_019e2298-adcb-7193-80fb-055e8282ec61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OilAndGasPurchasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-adcb-79fe-b419-a45f72f11510" xlink:to="loc_us-gaap_OilAndGasPurchasedMember_019e2298-adcb-7193-80fb-055e8282ec61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember_019e2298-adcb-7f06-beae-cb5a3f325dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-adcb-79fe-b419-a45f72f11510" xlink:to="loc_us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember_019e2298-adcb-7f06-beae-cb5a3f325dd1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_EnviromentalAttributesMember_019e2298-adcb-780f-b1c8-d93e131f6ff2" xlink:href="cnx-20260630.xsd#cnx_EnviromentalAttributesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e2298-adcb-79fe-b419-a45f72f11510" xlink:to="loc_cnx_EnviromentalAttributesMember_019e2298-adcb-780f-b1c8-d93e131f6ff2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019e2298-adcb-73b0-9a37-0099b7328ff4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e2298-adcb-7930-80ff-4e94023db7b6" xlink:to="loc_srt_MajorCustomersAxis_019e2298-adcb-73b0-9a37-0099b7328ff4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019e2298-adcb-73b0-9a37-0099b7328ff4_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019e2298-adcb-73b0-9a37-0099b7328ff4" xlink:to="loc_srt_NameOfMajorCustomerDomain_019e2298-adcb-73b0-9a37-0099b7328ff4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019e2298-adcb-753e-a20a-7bc0c42f0a25" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019e2298-adcb-73b0-9a37-0099b7328ff4" xlink:to="loc_srt_NameOfMajorCustomerDomain_019e2298-adcb-753e-a20a-7bc0c42f0a25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_NRGBusinessMarketingLLCMember_019e2298-adcb-7d4b-8bb7-cbbf3a24fba8" xlink:href="cnx-20260630.xsd#cnx_NRGBusinessMarketingLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019e2298-adcb-753e-a20a-7bc0c42f0a25" xlink:to="loc_cnx_NRGBusinessMarketingLLCMember_019e2298-adcb-7d4b-8bb7-cbbf3a24fba8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_CitadelEnergyMarketingLLCMember_019e2298-adcb-7b4d-beb3-1297e0d179e9" xlink:href="cnx-20260630.xsd#cnx_CitadelEnergyMarketingLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019e2298-adcb-753e-a20a-7bc0c42f0a25" xlink:to="loc_cnx_CitadelEnergyMarketingLLCMember_019e2298-adcb-7b4d-beb3-1297e0d179e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_DTEEnergyTradingInc.Member_019e2298-adcb-71d8-b3b2-67a627ebd8d1" xlink:href="cnx-20260630.xsd#cnx_DTEEnergyTradingInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019e2298-adcb-753e-a20a-7bc0c42f0a25" xlink:to="loc_cnx_DTEEnergyTradingInc.Member_019e2298-adcb-71d8-b3b2-67a627ebd8d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2298-adcb-7af4-a36b-e9ea5406a544" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2298-adcb-7af4-a36b-e9ea5406a544" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-adcb-7ba8-a86e-27f09cb8305a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnOilAndGasHedgingActivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-adcb-7ba8-a86e-27f09cb8305a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_OtherRevenueAndOperatingIncome_019e2298-adcb-7916-a0ff-a3cd96df92cb" xlink:href="cnx-20260630.xsd#cnx_OtherRevenueAndOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_cnx_OtherRevenueAndOperatingIncome_019e2298-adcb-7916-a0ff-a3cd96df92cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e2298-adcb-731a-bd25-287ed4254d7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_Revenues_019e2298-adcb-731a-bd25-287ed4254d7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_019e2298-adcb-78f9-9722-67b29cb4ec0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_OperatingLeaseExpense_019e2298-adcb-78f9-9722-67b29cb4ec0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019e2298-adcb-749b-b1dd-61c54055e7dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019e2298-adcb-749b-b1dd-61c54055e7dd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductionTaxExpense_019e2298-adcb-7d08-9511-46306a0d16c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProductionTaxExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_ProductionTaxExpense_019e2298-adcb-7d08-9511-46306a0d16c7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019e2298-adcb-789c-bd8d-366c1f165a09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019e2298-adcb-789c-bd8d-366c1f165a09" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019e2298-adcb-74ca-bb59-e41ecfd02d5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019e2298-adcb-74ca-bb59-e41ecfd02d5b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019e2298-adcb-7b76-a315-546e426c007d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019e2298-adcb-7b76-a315-546e426c007d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_019e2298-adcb-7ce9-ad66-bd706c03b368" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_CostsAndExpenses_019e2298-adcb-7ce9-ad66-bd706c03b368" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_019e2298-adcb-7152-969a-fa3560c215c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_019e2298-adcb-7152-969a-fa3560c215c0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019e2298-adcb-7167-bf4b-59a9789710a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019e2298-adcb-7167-bf4b-59a9789710a9" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e2298-adcb-7765-b093-17a14b35cce3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_Assets_019e2298-adcb-7765-b093-17a14b35cce3" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019e2298-adcb-74cd-85f7-76cf0ff85e7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019e2298-adcb-74cd-85f7-76cf0ff85e7f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019e2298-adcb-7345-907e-586d6ac9a5bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e2298-adcb-7f7d-8fb1-69320a4df529" xlink:to="loc_us-gaap_EquityMethodInvestments_019e2298-adcb-7345-907e-586d6ac9a5bf" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/SEGMENTINFORMATIONScheduleofReconciliationofSegmentInformationRevenueandOtherIncomeDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#SEGMENTINFORMATIONScheduleofReconciliationofSegmentInformationRevenueandOtherIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/SEGMENTINFORMATIONScheduleofReconciliationofSegmentInformationRevenueandOtherIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019e2298-adcb-7797-851f-5752d8beed63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019e2298-adcb-7878-aefe-e348c3904ecd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019e2298-adcb-7797-851f-5752d8beed63" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019e2298-adcb-7878-aefe-e348c3904ecd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e2298-adcb-7824-b208-d8535eaac4c3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_019e2298-adcb-7878-aefe-e348c3904ecd" xlink:to="loc_srt_ConsolidationItemsAxis_019e2298-adcb-7824-b208-d8535eaac4c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e2298-adcb-7824-b208-d8535eaac4c3_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e2298-adcb-7824-b208-d8535eaac4c3" xlink:to="loc_srt_ConsolidationItemsDomain_019e2298-adcb-7824-b208-d8535eaac4c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e2298-adcb-774f-973b-0e94065b8b9e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e2298-adcb-7824-b208-d8535eaac4c3" xlink:to="loc_srt_ConsolidationItemsDomain_019e2298-adcb-774f-973b-0e94065b8b9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e2298-adcb-7246-bf7d-48ceb80ec7c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e2298-adcb-774f-973b-0e94065b8b9e" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e2298-adcb-7246-bf7d-48ceb80ec7c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2298-adcb-7ca8-9ce5-41a9118a0e92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019e2298-adcb-7797-851f-5752d8beed63" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e2298-adcb-7ca8-9ce5-41a9118a0e92" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-adcb-78f2-816d-4d89cef40944" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnOilAndGasHedgingActivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019e2298-adcb-7797-851f-5752d8beed63" xlink:to="loc_us-gaap_GainLossOnOilAndGasHedgingActivity_019e2298-adcb-78f2-816d-4d89cef40944" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncome_019e2298-adcb-7997-9100-a34340894e79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019e2298-adcb-7797-851f-5752d8beed63" xlink:to="loc_us-gaap_OtherIncome_019e2298-adcb-7997-9100-a34340894e79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e2298-adcb-7d02-9674-afbabcac92b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_019e2298-adcb-7797-851f-5752d8beed63" xlink:to="loc_us-gaap_Revenues_019e2298-adcb-7d02-9674-afbabcac92b5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cnx.com/role/SUPPLEMENTALCASHFLOWINFORMATIONDetails" xlink:type="simple" xlink:href="cnx-20260630.xsd#SUPPLEMENTALCASHFLOWINFORMATIONDetails"/>
  <link:definitionLink xlink:role="http://www.cnx.com/role/SUPPLEMENTALCASHFLOWINFORMATIONDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_019e2298-adcb-7a21-9d99-de48cdff036b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSignificantNoncashTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsTable_019e2298-adcb-7dad-81a2-5dd5fdfb70be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSignificantNoncashTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_019e2298-adcb-7a21-9d99-de48cdff036b" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionsTable_019e2298-adcb-7dad-81a2-5dd5fdfb70be" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_019e2298-adcb-7117-a405-ba2af0ecc203" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsTable_019e2298-adcb-7dad-81a2-5dd5fdfb70be" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_019e2298-adcb-7117-a405-ba2af0ecc203" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019e2298-adcb-7117-a405-ba2af0ecc203_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSignificantNoncashTransactionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_019e2298-adcb-7117-a405-ba2af0ecc203" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019e2298-adcb-7117-a405-ba2af0ecc203_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019e2298-adcb-71a1-8156-e3b7cb835544" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSignificantNoncashTransactionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_019e2298-adcb-7117-a405-ba2af0ecc203" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019e2298-adcb-71a1-8156-e3b7cb835544" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cnx_NotesReceivedFromPropertySalesMember_019e2298-adcb-7dcb-a719-57ed5dd76266" xlink:href="cnx-20260630.xsd#cnx_NotesReceivedFromPropertySalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019e2298-adcb-71a1-8156-e3b7cb835544" xlink:to="loc_cnx_NotesReceivedFromPropertySalesMember_019e2298-adcb-7dcb-a719-57ed5dd76266" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_019e2298-adcb-7205-b0b5-9fd9306ef249" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_019e2298-adcb-7a21-9d99-de48cdff036b" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_019e2298-adcb-7205-b0b5-9fd9306ef249" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_019e2298-adcb-7968-8eaf-c4a80649d906" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_019e2298-adcb-7a21-9d99-de48cdff036b" xlink:to="loc_us-gaap_InterestPaidNet_019e2298-adcb-7968-8eaf-c4a80649d906" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIncomeTaxRefunds_019e2298-adcb-7e2f-83f0-c6eaa4f1c776" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIncomeTaxRefunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsLineItems_019e2298-adcb-7a21-9d99-de48cdff036b" xlink:to="loc_us-gaap_ProceedsFromIncomeTaxRefunds_019e2298-adcb-7e2f-83f0-c6eaa4f1c776" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
