Noun
1. a variation that deviates from the standard or norm;
"the deviation from the mean"2. the difference between an observed value and the expected value of a variable or function
3. the error of a compass due to local magnetic disturbances
4. deviate behavior
5. 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"