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English definition of “costume”

costume

noun [C/U]    /ˈkɑs·tum/
a set of clothes worn in order to look like someone else, esp. for a party or as part of an entertainment: [C] a clown costume A costume is also the set of clothes typical of a particular country or period of history: [U] The dancers dressed in national costume.
(Definition of costume noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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