#summary Definition of function arity.
#labels Glossary

= Arity =

The arity of a function is the number of arguments it accepts. Functions with specific arities are called names according to the following table:

|| Arity || Name ||
|| 0     || Nullary ||
|| 1     || Unary ||
|| 2     || Binary ||
|| 3     || Ternary ||
|| 4     || Tertiary ||