Deviation (law) definition

(1) A 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"

(2) Deviate behavior

(3) The error of a compass due to local magnetic disturbances

(4) The difference between an observed value and the expected value of a variable or function

(5) A variation that deviates from the standard or norm

"The deviation from the mean"