A series of three dramas which, although each of them is in one sense complete, have a close mutual relation, and form one historical and poetical picture. Shakespeare's " Henry VI." is an example.

a group of three films that together compose a larger narrative and are related in subject or theme Examples: Coppola's three Godfather films, the Terminator films trilogy, Terry Gilliam's 'Age of Reason' trilogy, Satyajit Ray's Apu trilogy, the Lord of the Rings trilogy, Ingmar Bergman's trilogy, the Qatsi trilogy, Spielberg's 'Indiana Jones' films, the original Star Wars trilogy, and Kieslowski's 'Three Colors' films

Three plays performed in sequence; the basic pattern of ancient Greek tragedies, of which one - Aeschylus' The Oresteia ( Agamemnon, The Libation Bearers, and The Eumenides) - is still extant.

a set of three literary or dramatic works related in subject or theme

A method of marketing games, where a third of the game, known as an episode, is distributed as shareware and the other two episodes are registered or purchased directly from the manufacturer.

Trilogy is the third album released by guitar virtuoso Yngwie J. Malmsteen issued in 1986 by the label Polydor. This album was produced in honor of the slain Swedish prime minister Olof Palme.

Trilogy is the third studio album by British progressive rock band Emerson, Lake & Palmer, originally released in 1972. The interior of the original gatefold sleeve features a photomontage showing multiple images of the band in a forest carpeted with autumn leaves.