Arity

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