/ ˈdesaɪl; NAmE ; NAmE also ˈdesl/ noun
( statistics ) 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)
••
WORD ORIGIN
late 17th cent.: from French décile , from a medieval Latin derivative of Latin decem ten.