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[tril-uh-jee] /ˈtrɪl ə dʒi/
noun, plural trilogies.
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
1655-65; < Greek trilogía. See tri-, -logy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for trilogy
Contemporary Examples
Historical Examples
  • The first three books under this heading form some sort of a trilogy, and have a definite air of consequence.

    H. G. Wells J. D. Beresford
  • Taking the trilogy as a whole, one will find that it is essentially symbolical.

  • Nor have I, the humblest person in the trilogy, yet suffered.

    'I Believe' and other essays Cyril Arthur Edward Ranger Gull
  • His second trilogy of books was his most artistic gift to French literature.

    Egoists James Huneker
  • It appears that the titles of the three dramas composing the trilogy were taken from the Chorus.

British Dictionary definitions for trilogy


noun (pl) -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
C19: from Greek trilogia; see tri-, -logy
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
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Word Origin and History for trilogy

"any series of three related works," 1660s, from Greek trilogia "series of three related tragedies performed at Athens at the festival of Dionysus," from tri- "three" (see three) + logos "story" (see logos).

Online Etymology Dictionary, © 2010 Douglas Harper
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trilogy in Technology
A strongly typed logic programming language with numerical constraint-solving over the natural numbers, developed by Paul Voda at UBC in 1988. Trilogy is syntactically a blend of Prolog, Lisp, and Pascal. It contains three types of clauses: predicates (backtracking but no assignable variables), procedures (if-then-else but no backtracking; assignable variables), and subroutines (like procedures, but with input and system calls; callable only from top level or from other subroutines).
Development of Trilogy I stopped in 1991. Trilogy II, developed by Paul Voda 1988-92, was a declarative general purpose programming language, used for teaching and to write CL.
["The Constraint Language Trilogy: Semantics and Computations", P. Voda, Complete Logic Systems, 741 Blueridge Ave, North Vancouver BC, V7R 2J5].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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