D defs.my
Entry 1 sense Webster, 1913

Tetralogy

/tĕ-trălʹ-ə-jē/ · Te·tral·o·gy · IPA /tɛˈtɹæləd͡ʒi/
01 n. A group or series of four dramatic pieces, three tragedies and one satyric, or comic, piece (or sometimes four tragedies), represented cons…
  1. 1.
    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.(Gr. Drama)