Arity

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In logic, mathematics, and computer science, the arity of a function/operation is the number of arguments/operands that the function/operation takes.

Table of arity/adicity

	Arity (Latin root)	Adicity (Greek root)	Number of arguments/parameters/operands
0	Nullary	Niladic (or medadic)
1	Unary	Monadic
2	Binary	Dyadic
3	Ternary	Triadic
4	Quaternary	Tetradic
5	Quinary	Pentadic
6	Senary	Hexadic
7	Septenary	Heptadic
8	Octonary	Octadic
9	Nonary (or novenary)	Enneadic
10	Denary	Decadic
11	Undenary	Hendecadic
12	Duodenary	Dodecadic
n	n-ary	n-adic	n
≥ 2	Multiary (or multary)	Polyadic	2 or more (plural arity/adicity)
?		Variadic	varying (indefinite arity/adicity)

External links

• Numeral prefix—Wikipedia.org.