PUISSANT Meaning of PUISSANT in English [ 'pju:ɪs(ə)nt , 'pwi:- , 'pwɪ- ]■ adjective archaic or literary having great power or influence.Derivatives~ly adverb OriginME: via OFr. from L. posse 'be able'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004