Quadrilogy vs. Tetralogy — What's the Difference?

A literary or artistic work consisting of four parts; a series or group of four related works; a tetralogy.

A tetralogy (from Greek τετρα- tetra-, "four" and -λογία -logia, "discourse"), also known as a quartet or quadrilogy, 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.

(nonstandard) A tetralogy.

A group of four related literary or operatic works.

A set of four related symptoms or abnormalities frequently occurring together.

A series of four related dramatic, operatic, or literary works.

(Medicine) A complex of four symptoms.

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.

(historical) A group of four dramas, three tragic and one satiric, exhibited together at the festivals of Dionysus at Athens.

(medicine) A combination of four symptoms.

Tetralogy of Fallot.

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 series of four related works (plays or operas or novels)