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 noun Tetralogy  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. 
 
 
 
 
 
 Collaborative International Dictionary of English 0.48 
 
 
 
 
 
 
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