Arity () is the number of arguments or operands taken by a function, operation or relation in logic, mathematics, and computer science. In mathematics, arity may also be named rank, but this word can have many other meanings in mathematics.

Arity

In logic, mathematics, and computer science, **arity** ( (listen)) is the number of arguments or operands taken by a function, operation or relation. In mathematics, arity may also be called rank, but this word can have many other meanings. In logic and philosophy, arity may also be called **adicity** and **degree**. In linguistics, it is usually named **valency**.