DUPLICITY Meaning of DUPLICITY in English [ dju:'plɪsɪti , djʊ- ]■ noun1》 deceitfulness. 2》 archaic the quality of being double.OriginME: from OFr. duplicite or late L. duplicitas , from L. duplic- (see duplex ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004