Bible Dictionaries
Tetralogy

Webster's Dictionary

(n.) 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.

Bibliography Information
Webster, Noah. Entry for 'Tetralogy'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/tetralogy.html. 1828.