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tetralogy (plural tetralogies)
- 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.
- (medicine) A combination of four symptoms.
- (medicine, colloquial) Tetralogy of Fallot.
- (four related works): quadrilogy (nonstandard)
- dilogy (2)
- trilogy (3)
- pentalogy (5)
- hexalogy (6)
- heptalogy (7)
- octalogy (8)
- ennealogy (9)
- decalogy (10)
- polylogy (2+)