deviation /ˌdiː.viˈeɪʃən/noun 9forms 1 noun9 •The act of deviating; wandering off the correct or true path or road. •A departure from the correct way of acting. •The state or result of having deviated; a transgression; an act of sin; an error; an offense.mankind’s deviation from divine will •The shortest distance between the center of the target and the point where a projectile hits or bursts. •For interval variables and ratio variables, a measure of difference between the observed value and the mean. •The signed difference between a value and its reference value. •A detour in a road or railway."A rough place, my last district; sixty navvies on the Springbank deviation works, let alone eighty of these dole bugs to attend to." — 1938 •A detour to one side of the originally-planned flightpath (for instance, to avoid weather); the act of making such a detour. •The voluntary and unnecessary departure of a ship from, or delay in, the regular and usual course of the specific voyage insured, thus releasing the underwriters from their responsibility. formsdeviations