OPPUGNANT Meaning of OPPUGNANT in English [ ə'pʌgnənt ]■ adjective formal opposing; antagonistic.Derivativesoppugnancy noun OriginC16: from L. ~- , oppugnare 'to attack' (see oppugn ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004