1.verbTo take part in a masquerade; to assemble in masks and costumes; to wear a disguise.
"I’m going to masquerade as the wikipede. What are you going to dress up as?"
2.verbTo pass off as a different person or a person with qualities that one does not possess; also, to make a pretentious show of being what one is not.
"He masqueraded as my friend until the truth finally came out."
3.verbTo conceal (someone) with, or as if with, a mask; to disguise.