trilogyPronunciation: /ˈtrɪlədʒi/Translate trilogy | into French | into German | into Italian | into Spanish Definition of trilogy noun (plural trilogies) a group of three related novels, plays, films, etc.: J.R.R. Tolkien’s epic fantasy trilogy, The Lord of the Rings (in ancient Greece) a series of three tragedies performed one after the other: the Aeschylean trilogy a group of three related things:a trilogy of cases reflected this developmenttrilogy in other Oxford dictionaries Definition of trilogy in the US English dictionary
