QUIESCENT Meaning of QUIESCENT in English [ kwɪ'ɛs(ə)nt , kwʌɪ- ]■ adjective in a state or period of inactivity.Derivativesquiescence noun~ly adverb OriginC17: from L. ~- , quiescere 'be still', from quies 'quiet'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004