Terms whose variables (such as x or y) with their exponents (such as the 2 in x^{2}) are the same.

Examples:

7x and 2x are **like terms** because they are both "x".

3x^{2} and −2x^{2} are **like terms** because they are both "x^{2}".

But 7x and 7x^{2} are NOT like terms (the exponents are different), they are **unlike terms**.

Like terms can be added together.

See: Term