Etymology
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deviation (n.)

late 14c., "a going astray, a turning aside from the (right) way or course, a going wrong, error," from Late Latin deviatus, past participle of deviare "turn aside, turn out of the way," from Latin phrase de via, from de "off, away" (see de-) + via "way" (see via). From 1630s as "departure from a certain standard or rule of conduct or original plan." Statistical sense is from 1858; standard deviation is from 1894. Related: Deviational.

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Definitions of deviation

deviation (n.)
a variation that deviates from the standard or norm;
the deviation from the mean
deviation (n.)
the difference between an observed value and the expected value of a variable or function;
deviation (n.)
the error of a compass due to local magnetic disturbances;
deviation (n.)
deviate behavior;
Synonyms: deviance
deviation (n.)
a turning aside (of your course or attention or concern);
Synonyms: diversion / digression / deflection / deflexion / divagation
From wordnet.princeton.edu