Arity Definition
 ârĭ-tē 
  arities
  
    noun
  
 The number of arguments or operands taken by a function or operator.
 American Heritage 
Other Word Forms of Arity
Noun
Singular:
 arityPlural:
 aritiesOrigin of Arity
–ar(y) (as in binary) (ternary) –ity
From American Heritage Dictionary of the English Language, 5th Edition
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