Definition of deviation
: an act or instance of deviating: such as
a
navigation
: deflection of the needle of a compass caused by local magnetic influences (as in a ship)
b
mathematics
: the difference between a value in a frequency distribution and a fixed number (such as the mean)
c
: departure from an established ideology or party line
deviation from Communist orthodoxy
d
: noticeable or marked departure from accepted norms (see norm sense 2) of behavior
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Merriam-Webster unabridged
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Time Traveler for deviation
The first known use of deviation was in the 15th century
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