The number of attributes (columns) in a database relation (table).

"Arity" is the number of arguments of a function. For example, the function Cos(x) has one argument and so we say that " Cos has arity 1". Arity of a function can be 0, 1, 2, ... Yacas allows to define functions with the same name but different arities, and different rules corresponding to these arities will be used. Also, it is possible to define a function with optional arguments, for example, Plot2D is one such function. Such functions can have any arity larger or equal to a certain minimum arity (the number of non-optional arguments). See also: Function , OpPrecedence , Rule .

A non-negative integer, representing the number of arguments in a structure.

Argument count (is number of arguments) of a compound term.

Arity is the number of arguments to a term. Atoms are considered as functors with zero arity. The notation Name/Arity is used to specify a functor of name Name with arity Arity.

The number of argument places that a predicate or function has; that is, the number of individual constants that must be assigned to a predicate in order to form an atomic sentence, or the number of terms that a function combines with to yield another term. Arity derives from terminology such as unary and binary, as applied to predicates or functions that have one argument place and two arguments places, respectively.

The arity of a structure is its number of arguments. For example, the structure customer(jones,85) has an arity of 2.

(n.) The number of arguments taken by a function. Arity is also sometimes used in place of valence.

From XSL Transformations (XSLT) 2.0 ( 2007-01-23) The arity of a stylesheet function is the number of xsl:param elements in the function definition.

In logic, mathematics, and computer science, the arity (synonyms include type, adicity, and rank) of a function or operation is the number of arguments or operands that the function takes. The arity of a relation is the number of domains in the corresponding Cartesian product.