deviationde·vi·a·tion /ˌdiːviˈeɪʃən/ noun1[countableC, uncountableU] a noticeable difference from what is expected or acceptableAny deviation in the current inflation rate could send stocks sharply up or down.
deviation fromThe sudden rise in market prices was an unexpected deviation from the norm.
2[countableC]STATISTICS a difference between a number or measurement in a set and the average of all the numbers or measurements in that set
→ standard deviation