Noun
1. an event that departs from expectations
2. discord that splits a group
3. the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value
4. a difference between conflicting facts or claims or opinions;
"a growing divergence of opinion"5. the quality of being subject to variation
6. an activity that varies from a norm or standard;
"any variation in his routine was immediately reported"