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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.
| 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) |
