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trilogy (n.)

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).

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Definitions of trilogy from WordNet

trilogy (n.)
a set of three literary or dramatic works related in subject or theme;
From wordnet.princeton.edu