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Entry 4 senses Webster, 1913

Variance

/vĕr'-ē-əns/ · Va·ri·ance · IPA /ˈvæɹ.i.əns/
01 n. The quality or state of being variant; change of condition; variation.
  1. 1.
    The quality or state of being variant; change of condition; variation.
  2. 2.
    Difference that produces dispute or controversy; disagreement; dissension; discord; dispute; quarrel.
    “That which is the strength of their amity shall prove the immediate author of their variance.” — Shak.
  3. 3.
    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.(Law)
  4. 4.
    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.(Statistics)
Phrases & compounds
At variance — in disagreement; in a state of dissension or controversy; at enmity.