Definition of decile noun from the Oxford Advanced American Dictionary

 

decile

 noun
noun
NAmE//ˈdɛsaɪl//
 
, NAmE//ˈdɛsl//
 
(statistics)
 
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one of ten equal groups into which a collection of things or people can be divided according to the distribution of a particular variable families in the top decile of income (= the 10% of families with the highest income)
See the Oxford Advanced Learner's Dictionary entry: decile