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tetralogy

Source : Webster's Revised Unabridged Dictionary (1913)

Tetralogy \Te*tral"o*gy\, n. [Gr. ?; te`tra- (see {Tetra-}) + ?
   a speech, discourse: cf. F. t['e]tralogie.] (Gr. Drama)
   A group or series of four dramatic pieces, three tragedies
   and one satyric, or comic, piece (or sometimes four
   tragedies), represented consequently on the Attic stage at
   the Dionysiac festival.

   Note: A group or series of three tragedies, exhibited
         together without a fourth piese, was called a trilogy.

Source : WordNet®

tetralogy
     n : a series of four related works (plays or operas or novels)
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