variance

n. [ L. variantia. ] 1. The quality or state of being variant; change of condition; variation. [ 1913 Webster ]

2. Difference that produces dispute or controversy; disagreement; dissension; discord; dispute; quarrel. [ 1913 Webster ]

That which is the strength of their amity shall prove the immediate author of their variance. Shak. [ 1913 Webster ]

3. (Law) A disagreement or difference between two parts of the same legal proceeding, which, to be effectual, ought to agree, -- as between the writ and the declaration, or between the allegation and the proof. Bouvier. [ 1913 Webster ]

4. (Statistics) The expected value of the square of the deviation from the mean of a randomly distributed variable; the second moment about the mean. This is also the square of the standard deviation. [ PJC ]

At variance, in disagreement; in a state of dissension or controversy; at enmity. “What cause brought him so soon at variance with himself?” Milton. [ 1913 Webster ]