ETYM Latin de + via way, road.
1. To be at variance with; be out of line with; SYN. vary, diverge, depart.
2. To cause to turn away from a previous or expected course.
3. To turn aside; turn away from; SYN. divert.

Departing significantly from the behavioral norms of a particular society

1. One that deviates from a norm; especially; a person who differs markedly from a group norm
2. A statistical variable that gives the deviation of another variable from a fixed value (as the mean)