domain of a variable
The base set of numbers or quantities that can be mapped to a second set.

In elementary algebra, the domain of a function y = f(x) is the set of values that the independent variable x can take. For example, if y = f(x) = arcsin(x), then the domain might be defined as all the numbers whose absolute value is no more than 1, that is, |x| < 1.

Related Term: range (of a function)

English | Espaņol