N-ary

$n$-ary may refer to:
 * The arity of a function, operation, or relation
 * $n$-ary associativity, a specific rule attached to $n$-ary functions
 * $n$-ary group, a generalization of group
 * The radix of a numerical representation system
 * The number of letters in an alphabet (formal languages)
 * An $n$-ary code
 * An $n$-ary Gray code
 * An $n$-ary Huffman code
 * An $n$-ary tree