deviation in WordNet English dictionary

1. 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"
   diversion  deviation  digression  deflection  deflexion  divagation 
   
2. a variation that deviates from the standard or norm
   "the deviation from the mean"
   deviation  divergence  departure  difference 
   
3. deviate behavior
   deviation  deviance 
   
4. the error of a compass due to local magnetic disturbances
   deviation 
   
5. the difference between an observed value and the expected value of a variable or function
   deviation