/ ˈkwɔːtaɪl; NAmE ˈkwɔːrt-; -tl/ noun
( statistics ) one of four equal groups into which a set of things can be divided according to the distribution of a particular variable :
women in the fourth quartile of height (= the shortest 25% of women)
—compare quintile
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WORD ORIGIN
late 19th cent.: from medieval Latin quartilis , from Latin quartus fourth.