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n. pl. ar·i·ties
The number of arguments or operands taken by a function or operator.

[-ar(y) (as in binary ternary) + -ity.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Noun1.arity - the number of arguments that a function can take
logic - the branch of philosophy that analyzes inference
number - a concept of quantity involving zero and units; "every number has a unique position in the sequence"
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References in periodicals archive ?
Every relationship, even a unary or nullary relationship, has two levels, synetic and diffeonic, with the synetic level consisting of common attributes or accepting-syntactic invariants, and the diffeonic level consisting of some number of discernible instances thereof (this number being the arity of the relationship).
We point out that a homomorphism of sup-algebras has to preserve also nullary operations.
Remember that in first order logic (FOL), constants are considered as nullary functions.
A semiring means an algebra (S, +, *, 0, 1), where + and * are binary, 0 and 1 are nullary, satisfying the following conditions: