variance - noun

an event that departs from expectations

discord that splits a group

the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value

a difference between conflicting facts or claims or opinions

the quality of being subject to variation

an official dispensation to act contrary to a rule or regulation (typically a building regulation)

an activity that varies from a norm or standard

variance - thesaurus

disagreement   discrepancy   divergence   division   variability   variableness   variant   variation