trilogy

[ tril-uh-jee ]
/ ˈtrɪl ə dʒi /

noun, plural tril·o·gies.

a series or group of three plays, novels, operas, etc., that, although individually complete, are closely related in theme, sequence, or the like.
(in ancient Greek drama) a series of three complete and usually related tragedies performed at the festival of Dionysus and forming a tetralogy with the satyr play.
a group of three related things.

Origin of trilogy

From the Greek word trilogía, dating back to 1655–65. See tri-, -logy

Example sentences from the Web for trilogy

British Dictionary definitions for trilogy

trilogy
/ (ˈtrɪlədʒɪ) /

noun plural -gies

a series of three related works, esp in literature, etc
(in ancient Greece) a series of three tragedies performed together at the Dionysian festivals

Word Origin for trilogy

C19: from Greek trilogia; see tri-, -logy