masquerade : Idioms & Phrases
masquerade ball
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noun a ball at which guests wear costumes and masks
masked ball; fancy-dress ball.
WordNet
masquerade costume
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noun a costume worn as a disguise at a masquerade party
masquerade; fancy dress.
WordNet
masquerade party
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noun a party of guests wearing costumes and masks
masquerade; masque; mask.