The act of varying or the state of being variable. / A difference between what is expected and what is observed; deviation. / The state of differing or being in conflict.

plural of variance

(idiomatic) not in accord; in a state of disagreement

plural of variancy

Alternative form of variance

(obsolete or rare) Covariance.

plural of product variance

(statistics) A collection of statistical models, and their associated procedures, in which the observed variance is partitioned into components due to different explanatory variables.