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Meaning of trilogy

tril•o•gy

Pronunciation: (tril'u-jē), [key]
— pl. -gies.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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