What is "tetralogy"

Tetralogy \Te*tral"o*gy\, n. [Gr. ?; te`tra- (see Tetra-) + ? a speech, discourse: cf. F. t['e]tralogie.] (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.

1650s, from Greek tetralogia, from tetra- (see tetra-) + -logia (see -logy). A group of four dramatic compositions, originally three tragedies (the trilogia) and a Satyric play.

n. 1 A set of four works of art that are connected, and that can be seen either as a single work or as four individual works. They are commonly found in literature, film, or video games. 2 (context medicine English) A combination of four symptoms.

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

A tetralogy (from Greek τετρα- tetra-, "four" and -λογία -logia, "discourse") is a compound work that is made up of four distinct works. The name comes from the Attic theater, in which a tetralogy was a group of three tragedies followed by a satyr play, all by one author, to be played in one sitting at the Dionysia as part of a competition.

Antiphon of Rhamnus, an orator, taught his students with Tintitives, each one consisting of four speeches: the prosecutor's opening speech, the first speech for the defence, the prosecutor's reply, and the defendant's conclusion. Three of Antiphon's tetralogies survive. In more recent times, Shakespeare wrote two tetralogies, the first consisting of the three Henry VI plays and Richard III, and the second consisting of Richard II, the two Henry IV plays, and Henry V. Richard Wagner's Der Ring des Nibelungen ("The Ring of the Nibelung" or "The Ring Cycle") is also referred to as a tetralogy.

As an alternative to "tetralogy", "quartet" is sometimes used, particularly for series of four books. The term "quadrilogy", basing the prefix on Latin prefix quadri- instead of the Greek prefix, and first recorded in 1865, has also been used for marketing series of movies, such as the Alien series.