the output variable of a relationship

the input variable of a relationship

the set of values of the dependent variable for which a function is defined

the set of values of the independent variable of a function or relation

a relationship between two variables

a value (letter or numeric) that does not change

a mathematical phrase that contains variables, function, numbers, and/or operations, but does not contain equal or inequality signs

a letter or other symbol that is used in a mathematical expression to represent a value that can change or vary

a relation where each element of the domain corresponds to exactly one element of the range