IRREVOCABLE Meaning of IRREVOCABLE in English [ ɪ'rɛvəkəb(ə)l ]■ adjective not able to be changed, reversed, or recovered.Derivativesirrevocability nounirrevocably adverb OriginME: from OFr., or from L. irrevocabilis . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004