variance
1.
2. The state or fact of differing or of being in conflict. See synonyms at discord.
3. Law. a. A discrepancy between two statements or documents in a proceeding. b. License to engage in an act contrary to a usual rule: a zoning variance.
4. Statistics. The square of the standard deviation.
5. Chemistry. The number of thermodynamic variables, such as temperature and pressure, required to specify a state of equilibrium of a system, given by the phase rule.
at variance
In a state of discrepancy; differing: The facts are at variance with your story.