TRAPEZIUM Meaning of TRAPEZIUM in English n. (pl. trapezia or trapeziums) 1 Brit. a quadrilateral with only one pair of sides parallel. 2 US = TRAPEZOID 1. [ LL f. Gk trapezion f. trapeza table ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012