A Variance

1. The act of varying or the state of being variable.
2. A difference between what is expected and what is observed; deviation.
3. The state of differing or being in conflict.
4. An official permit to do something that is ordinarily forbidden by regulations.
5. (law) A discrepancy between two legal documents.
6. (law) A departure from a cause of action originally in a complaint.
7. (statistics) The second central moment in probability. Variance - Wikipedia
8. (physics, chemistry, biology) The number of degrees of freedom in a system.
9. (computing, programming) Covariance and contravariance generally

Variance - Wikipedia