Definition of quintile noun from the Oxford Advanced American Dictionary

 

quintile

 noun
noun
NAmE//ˈkwɪntaɪl//
 
(statistics)
 
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one of five equal groups into which a set of things can be divided according to the distribution of a particular variable men in the first quintile of weight (= the heaviest 20% of men) compare quartile
See the Oxford Advanced Learner's Dictionary entry: quintile