noun, plural disparities.
lack of similarity or equality; inequality; difference: a disparity in age; disparity in rank.

1545–55; < Middle French desparite < Late Latin disparitās; see dis-1, parity1

nondisparity, noun, plural nondisparities.

See difference.
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World English Dictionary
disparity (dɪˈspærɪtɪ)
n , pl -ties
1.  inequality or difference, as in age, rank, wages, etc
2.  dissimilarity

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1550s, from M.Fr. disparité, from L.L. disparitatem "inequality," from L. dis- "not" + L.L. paritas (gen. paritatis) "parity" (see parity). Related: Disparities.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Although the reason for this difference is not yet known, it is a true
Income disparity is always a subjective observation, with observations often
  occuring on the local level.
Their proximity to one another only accentuates the disparity.
These are average figures and the disparity is greater if particular areas are
  singled out.
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