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# variance

## Definitions

### from The American Heritage® Dictionary of the English Language, 4th Edition

• n. The act of varying.
• n. The state or quality of being variant or variable; a variation.
• n. A difference between what is expected and what actually occurs.
• n. The state or fact of differing or of being in conflict. See Synonyms at discord.
• n. Law A discrepancy between two statements or documents in a proceeding.
• n. Law License to engage in an act contrary to a usual rule: a zoning variance.
• n. Statistics The square of the standard deviation.
• n. 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.
• idiom at variance In a state of discrepancy; differing: The facts are at variance with your story.

• n. The act of varying or the state of being variable
• n. A difference between what is expected and what happens
• n. The state of differing or being in conflict
• n. A discrepancy, especially between two legal documents
• n. The second central moment in probability
• n. covariance and contravariance generally

### from the GNU version of the Collaborative International Dictionary of English

• n. The quality or state of being variant; change of condition; variation.
• n. Difference that produces dispute or controversy; disagreement; dissension; discord; dispute; quarrel.
• n. 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.
• n. 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.

### from The Century Dictionary and Cyclopedia

• n. In physical chemistry, that property of a chemical system which is expressed by the equation V = c + 2 — φ, where V is the variance, c the number of independent components, and φ the number of phases in which the system may exist. Systems are said to be invariant, univariant, bivariant, multivariant, etc., according to the value of V.
• n. The state of being or the act of becoming variant; alteration; variation; change; difference.
• n. In law, a discrepancy: Between pleadings and proof, as where a complaint mentions a wrong date, or the facts prove to be different from what was alleged.
• n. Between the form of the writ or process by which the action was commenced and the form of the declaration or complaint.
• n. Difference that produces disagreement or controversy; dispute; dissension; discord.
• n. Variableness; inconstancy.
• n. In a state of controversy or dissension; in a state of opposition or enmity.
• n. Synonyms and Disagreement, etc. See difference.

• n. discord that splits a group
• n. the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value
• n. an official dispensation to act contrary to a rule or regulation (typically a building regulation)
• n. the quality of being subject to variation
• n. a difference between conflicting facts or claims or opinions
• n. an event that departs from expectations
• n. an activity that varies from a norm or standard

## Etymologies

From Old French variance. (Wiktionary)