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English definition of “upper class”

upper class

noun [S, + sing/pl verb] uk   (also the upper classes [plural]) us  
C1 a social group consisting of the people who have the highest social rank and who are usually rich: The upper classes usually send their children to expensive private schools.
upper-class
adjective uk   /ˌʌp.əˈklɑːs/ us    /-ɚˈklæs/
C1 She comes from a very upper-class family.
(Definition of upper class from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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