Synonyms for variation
noun
Change
modification, alteration, mutation, diversification, deviation, shift, fluctuation, deflection, aberration, departure, variety, adaptation, curve, bend, turn, divergence, veer, digression, swerve, displacement, warping; see also change 1.
Antonyms stability*, fixity, unchangeableness.
Disparity
inequality, difference, dissimilarity, dissimilitude, distinction, disproportion, exception, contrast, contradistinction, unconformity, irregularity, aberration, abnormality, disparity.
Antonyms similarity*, conformity, likeness.
See variation in Webster's New World Roget's A-Z Thesaurus II
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