The word 'variance' entered English in the late 14th century via Anglo-French, denoting the fact of undergoing change. Its core component, 'vari-', originates from the Latin adjective varius, meaning "speckled, variegated, changeable," which itself may derive from a Proto-Indo-European root with a sense of difference or variation. The suffix '-ance' was adopted from the French noun-forming pattern, solidifying the abstract concept of the state or quality of being changeable. Over centuries, this literal sense of "the quality of varying" specialized into its modern meanings, encompassing both general inconsistency and the precise mathematical measure of statistical dispersion.

Structure: vari (change) + ance (noun suffix) vari (from Latin varius, meaning "varied, changeable, diverse"); ance (a noun-forming suffix of Latin origin via French, indicating a state, quality, or action).