Definition of quintile noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈkwɪntaɪl//
; NAmE NAmE//ˈkwɪntaɪl//
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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 Word Originearly 17th cent.: from Latin quintilis (mensis) ‘fifth month, July’, from quintus ‘fifth’.
See the Oxford Advanced American Dictionary entry: quintile