A 'deviation' is a difference or the (real or metaphorical) route followed by a different choice.
'Deviation' can refer to:
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Deviation (statistics), the difference between the value of an observation and the mean of the population in mathematics and statistics.
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Standard deviation, which is based on the square of the difference.
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Absolute deviation, where the absolute value of the difference is used.
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Frequency deviation, the maximum allowed "distance" in FM radio from the nominal frequency a station broadcasts at.
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Magnetic deviation, the error induced in compasses by local magnetic fields.
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Deviationism, an expressed belief which is not in accordance with official party doctrine.
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Deviation Records, a record label.
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Deviant behavior, a behavior that is a recognized violation of social norms.
'
Deviates' is also the name of an American punk rock band.