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


costume party

BrE BrE//ˈkɒstjuːm pɑːti//
; NAmE NAmE//ˈkɑːstuːm pɑːrti//
(North American English)
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a party where all the guests wear special clothes, in order to look like a different person, an animal, etc.
See the Oxford Advanced American Dictionary entry: costume party