# Arity

**Arity** (/ˈærɪti/ (listen)) is the number of arguments or operands taken by a function or operation in logic, mathematics, and computer science. In mathematics, arity may also be named *rank*,[1][2] but this word can have many other meanings in mathematics. In logic and philosophy, it is also called **adicity** and **degree**.[3][4] In linguistics, it is usually named **valency**.[5]