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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

Explanation

If you’ve just started a trilogy of books, you’ll be reading for a while. A trilogy is something that has three parts, so you'll have three books to read. You can see the tri-, meaning "three," in trilogy. The word originates from the Greek word trilogia, meaning "series of three related tragedies performed at Athens at the festival of Dionysus." Today, you can use trilogy to describe three of anything, such as a trilogy of movies that has the same characters, settings, and themes.

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Vocabulary lists containing trilogy

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.

According to Variety, the studio has been auditioning actors for the last few weeks and has tapped “Game of Thrones” and “Star Wars” sequel trilogy casting director Nina Gold for the process.

From Los Angeles Times • May 15, 2026

Now, the next adventure of the fierce bounty hunter and his adorable young charge will be the franchise’s first big-screen installment since the sequel trilogy wrapped with “Episode IX — The Rise of Skywalker.”

From Los Angeles Times • May 14, 2026

A third meeting with Usyk feels unlikely in the immediate future; the Ukrainian appears to have his number stylistically and there is limited appetite for a trilogy already settled twice.

From BBC • May 10, 2026

Throughout the Cal Hooper trilogy, what is said—and left unsaid—is as important as what happens.

From The Wall Street Journal • Apr. 24, 2026

Everyone in the Annex except Mr. van Daan and Peter has read the Hungarian Rhapsody trilogy, a biography of the composer, piano virtuoso and child prodigy Franz Liszt.

From "The Diary of a Young Girl" by Anne Frank

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