Term that refers to a special number (coefficient, ratio, etc.).

In a mathematical expression, a number that does not have a variable or that has a zero-degree monomial also is called a constant.

### Examples

- In the expression
*y*= m*x*+*b*, parameter*b*is a constant. - The ratio of the lengths of the corresponding segments of similar figures is a constant.
- In the polynomial expression P(
*x*) = 2*x*³ + 4*x*² – 7*x*+ 12, the number 12 is a constant or a constant term, as it is a coefficient with a monomial of*x*^{0}whose value is 1.