Etymology
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tetralogy (n.)

1650s, from Greek tetralogia, from tetra- "four" (from PIE root *kwetwer- "four") + -logia (see -logy). A group of four dramatic compositions, originally three tragedies (the trilogia) and a Satyric play.

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Definitions of tetralogy

tetralogy (n.)
a series of four related works (plays or operas or novels);
From wordnet.princeton.edu