1. The quality of being the same in quantity or measure or value or status.
2. A state of being essentially equal or equivalent; equally balanced.
3. Rights, treatment, quantity, or value equal to all others in a specific group; such as, they should have full equality under the law.
4. An equation in which the quantities on each side of an equal sign are the same.
5. In mathematics, a statement, usually an equation, that one thing equals another.