/te tral"euh jee, -trah"leuh-/ , n. , pl. tetralogies .
1. a series of four related dramas, operas, novels, etc.
2. a group of four dramas, three tragedies and one satyr play, performed consecutively at the festival of Dionysus in ancient Athens.
[ 1650-60; tetralogía. See TETRA-, -LOGY ]