Definition of quartile noun from the Oxford Advanced American Dictionary

 

quartile

 noun
noun
NAmE//ˈkwɔrtaɪl//
 
, NAmE//ˈkwɔrt̮l//
 
(statistics)
 
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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
See the Oxford Advanced Learner's Dictionary entry: quartile