deviation

noun

1. 1

   a turning aside (of your course or attention or concern)

   a diversion from the main highway

   a digression into irrelevant details

2. 2

   deviate behavior

3. 3

   the error of a compass due to local magnetic disturbances

4. 4

   the difference between an observed value and the expected value of a variable or function

5. 5

   a variation that deviates from the standard or norm

   the deviation from the mean