trilogy

[tril-uh-jee]
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.

Origin:
1655–65; < Greek trilogía. See tri-, -logy

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World English Dictionary
trilogy (ˈtrɪlədʒɪ)
 
n , pl -gies
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
 
[C19: from Greek trilogia; see tri-, -logy]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

trilogy
1661, "any series of three related works," from Gk. trilogia "series of three related tragedies performed at Athens at the festival of Dionysus," from tri- "three" + logos "story."
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

Trilogy definition

language
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.
(http://fmph.uniba.sk/~voda).
["The Constraint Language Trilogy: Semantics and Computations", P. Voda, Complete Logic Systems, 741 Blueridge Ave, North Vancouver BC, V7R 2J5].
(2000-04-08)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica
Encyclopedia

trilogy

a series of three dramas or literary or musical compositions that, although each is in one sense complete, have a close mutual relation and form one theme or develop aspects of one basic concept. The term originally referred specifically to a group of three tragedies written by one author for competition. This trilogy constituted the traditional set of plays presented in Athens by a number of competitors at the 5th-century-BC drama festivals known as the Great Dionysia. One of the first authors to present such a trilogy was Aeschylus, whose Oresteia is the only surviving example from that time. Modern examples of trilogies include Robertson Davies's Deptford Trilogy and Roddy Doyle's Barrytown Trilogy.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Nor, according to the third of this convenient trilogy of papers, is a sense of
  fairness rooted in culture.
Most major action set pieces from the trilogy have been re-created in the game.
The first of a promised trilogy from a master of fiction.
But the second trilogy certainly had a built-in audience.
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