arity

Etymology

From -ary (taken from {{m|en|unary/binary/ternary [function/operator]}}) + -ity. Compare adicity and adinity.

noun

1. (logic, mathematics, computer science) The number of arguments or operands a function or operation takes. For a relation, the number of domains in the corresponding Cartesian product.
2. (mathematics, computer science) The maximum number of child nodes that any node in a given tree (data structure) may have.
3. (Lojban grammar) the number of arguments (in Lojban grammar called sumti) specified in the definition of a selbri. (the selbri combined with the sumti make up a bridi).