noun
( -s )
Etymology: Middle English impugnacioun, impungnacioun, from Middle French or Latin; Middle French impugnation, from Latin impugnation-, impugnatio, from impugnatus (past participle of impugnare to impugn) + -ion-, -io -ion
1. ˌimˌpəgˈnāshən obsolete : attack , opposition
2. ˌimˌpyüˈn- archaic : impugnment