arity

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English[edit]

Etymology[edit]

From -ary (taken from unary/binary/ternary [function/operator]) + -ity. Compare adicity and adinity, based on the corresponding Greek root.

Pronunciation[edit]

Noun[edit]

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arity ‎(plural arities)

  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.

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