te·tral·o·gy /tɛˈtrɑləʤi, ˈtræ-/
四部曲,四聯劇,四部劇
Te·tral·o·gy n. 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.
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tetralogy
n : a series of four related works (plays or operas or novels)