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English definition of “costume”

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costume

noun uk   /ˈkɒs.tjuːm/ us    /ˈkɑː.stuːm/
B2 [C or U] the set of clothes typical of a particular country or period of history, or suitable for a particular activity: Singers performing Mozart's operas often dress in/wear historical costume. The dancers leading the procession were in colourful and elaborate costumes. UK The shop has a good selection of bikinis and bathing/swimming costumes.B2 [C] ( UK also fancy-dress costume) a set of clothes worn in order to look like someone or something else, especially for a party or as part of an entertainment: Our host was wearing a clown costume. The children were dressed in Halloween costumes.
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(Definition of costume from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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