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