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trilogy

American  
[tril-uh-jee] / ˈtrɪl ə dʒi /

noun

plural

trilogies

  1. a series or group of three plays, novels, operas, etc., that, although individually complete, are closely related in theme, sequence, or the like.

  2. (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.

  3. a group of three related things.

trilogy British  
/ ˈtrɪlədʒɪ /

noun

  1. a series of three related works, esp in literature, etc

  2. (in ancient Greece) a series of three tragedies performed together at the Dionysian festivals

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of trilogy

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Granada Television produced a lavish 12-part adaptation of the first trilogy, entitled Game, Set and Match.

From BBC • Mar. 17, 2026

“Dune” stars Zendaya and Javier Bardem joined Denis Villeneuve to preview the trailer for the conclusion to his famed sci-fi trilogy.

From Los Angeles Times • Mar. 17, 2026

The animation is voiced by actor Domhnall Gleeson, who has starred in films such as “About Time,” the “Harry Potter” series, the “Star Wars” sequel trilogy and Taylor Swift’s recent music video “Opalite.”

From MarketWatch • Mar. 13, 2026

New Zealand filmmaker Peter Jackson, best known for The Lord of the Rings trilogy, will also be awarded an Honorary Palme d'Or during the festival.

From Barron's • Mar. 11, 2026

Nali drove through Gallup to the main public library, where Nathan checked out a science-fiction trilogy about kids who were drafted by the government to fight an interstellar war against aliens.

From "Healer of the Water Monster" by Brian Young

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.