-ary may refer to: The arity of a function, operation, or relation -ary associativity, a specific rule attached to -ary functions -ary group, a generalization of group The radix of a numerical representation system The number of letters in an alphabet (formal languages) An -ary code An -ary Gray code An -ary Huffman code An -ary tree See also n- (disambiguation)#Mathematics, science and technology Unary (disambiguation) Binary (disambiguation) Ternary (disambiguation)