/ ˈkwɪntaɪl; NAmE / noun
( statistics ) 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
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WORD ORIGIN
early 17th cent.: from Latin quintilis (mensis) fifth month, July, from quintus fifth.