What does "masquerade" mean?

Additional senses

1. 2.Acting or living under false pretenses; concealment of something by a false or unreal show; pretentious show; disguise. That masquerade of misrepresentation which invariably accompanied the political eloquence of Rome. De Quincey.
2. 3.A Spanish diversion on horseback.
3. 4.To assemble in masks; to take part in a masquerade.
4. 5.To frolic or disport in disquise; to make a pretentious show of being what one is not. A freak took an ass in the head, and he goes into the woods, masquerading up and down in a lion's skin. L'Estrange.
5. 6.To conceal with masks; to disguise. "To masquerade vice." Killingbeck.