TRILOGY Meaning of TRILOGY in English n. (pl. -ies) 1 a group of three related literary or operatic works. 2 Gk Antiq. a set of three tragedies performed as a group. [ Gk trilogia (as TRI-, -LOGY) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012