1. (noun)masquerade, masquerade party, masque, mask a party of guests wearing costumes and masks
2. (noun)fancy dress, masquerade, masquerade costume a costume worn as a disguise at a masquerade party
3. (noun)masquerade making a false outward show
"a beggar's masquerade of wealth"
4. (verb)masquerade take part in a masquerade
5. (verb)masquerade pretend to be someone or something that you are not
"he is masquerading as an expert on the internet"; "This silly novel is masquerading as a serious historical treaty"