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Definition of costume party noun from the Oxford Advanced Learner's Dictionary

costume party

noun
 
/ˈkɒstjuːm pɑːti/
 
/ˈkɑːstuːm pɑːrti/
(especially North American English)
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  1. a party where all the guests wear special clothes, in order to look like a different person, an animal, etc.
    • They celebrated New Year's Eve with a costume party.
    compare fancy dress
See costume party in the Oxford Advanced American Dictionary
trait
noun
 
 
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