tetralogy Meaning, Definition & Usage

  1. noun a series of four related works (plays or operas or novels)

WordNet

Te*tral"o*gy noun
Etymology
Gr. (see Tetra-) + a speech, discourse: cf. F. tétralogie.
Definitions
  1. (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. ✍ A group or series of three tragedies, exhibited together without a fourth piese, was called a trilogy.

Webster 1913