OBSOLESCENT Meaning of OBSOLESCENT in English [ ˌɒbsə'lɛs(ə)nt ]■ adjective becoming obsolete.Derivativesobsolesce verbobsolescence noun OriginC18: from L. ~- , obsolescere 'fall into disuse'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004