SUBJACENT Meaning of SUBJACENT in English [ səb'dʒeɪs(ə)nt ]■ adjective technical situated below something else.Derivativessubjacency noun OriginC16: from L. ~- 'lying underneath', from sub- 'under' + jacere 'to lie'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004