Definitions
1.NounA 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.
A group of four dramas, three tragic and one satiric, exhibited together at the festivals of Dionysus at Athens.
2.NounA group of four dramas, three tragic and one satiric, exhibited together at the festivals of Dionysus at Athens.
3.NounA combination of four symptoms.
4.NounTetralogy of Fallot.