Open English Wordnet
Nouns
(n)deviation, divergence, departure, differencea variation that deviates from the standard or norm“the deviation from the mean”
(n)diversion, deviation, digression, deflection, deflexion, divagationa 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”