de·vi·a·tion /ˌdi:viˈeɪʃən/ noun plural de·vi·a·tions
an action, behavior, or condition that is different from what is usual or expected [count
] ▪ There have been slight deviations in the satellite's orbit. ▪ Having juice instead of coffee was a deviation from his usual routine.
] ▪ The pattern's deviation from the norm is significant. ▪ The book discusses sexual deviation [=deviance] in serial killers.
] technical :
the difference between the average of a group of numbers and a particular number in that group