Noun
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an activity that varies from a norm or standard
"any variation in his routine was immediately reported"
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an official dispensation to act contrary to a rule or regulation (typically a building regulation)
"a zoning variance"
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the quality of being subject to variation
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a difference between conflicting facts or claims or opinions
"a growing divergence of opinion"
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the second moment around the mean
the expected value of the square of the deviations of a random variable from its mean value
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discord that splits a group
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an event that departs from expectations