ADEQUATE Meaning of ADEQUATE in English ■ adjective satisfactory or acceptable.Derivativesadequacy noun~ly adverb OriginC17: from L. adaequat- , adaequare 'make equal to', from ad- 'to' + aequus 'equal'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004