#1 deviation n. [divergence, departure, difference] a variation that deviates from the standard or norm; "the deviation from the mean". wn
#2 deviation n. the difference between an observed value and the expected value of a variable or function. wn
#3 deviation n. the error of a compass due to local magnetic disturbances. wn
#4 deviation n. [deviance] deviate behavior. wn
#5 deviation n. [diversion, digression, deflection, deflexion, divagation] a turning aside (of your course or attention or concern); "a diversion from the main highway"; "a digression into irrelevant details"; "a deflection from his goal". wn
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