The definition of disparity is a difference.
(noun)When you make $100,000 and your neighbor makes $20,000, this is an example of a large disparity in income.
See disparity in Webster's New World College Dictionary
noun pl. disparities
Origin: Fr disparité < ML disparitas < L dispar, unequal: see dis- & par
See disparity in American Heritage Dictionary 4
noun pl. dis·par·i·ties
Origin:
Origin: French disparité
Origin: , from Old French desparite
Origin: , from Late Latin disparitās
Origin: : Latin dis-, dis-
Origin: + Late Latin paritās, equality; see parity1
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