An expression of more than two algebraic terms, especially the sum of several terms that contain different powers of the same variable(s).
Coefficient - a numerical or constant quantity placed before and multiplying the variable in an algebraic expression
Constant - a number expressing a relation or property that remains the same in all circumstances, or for the same substance under the same conditions.
Variable - letter in an equation that represents an unknown number
Equation - a statement that the values of two mathematical expressions are equal (indicated by the sign =)