Definition of "Mask" :

noun: activity that tries to conceal something

"No mask could conceal his ignorance."

noun: a covering to disguise or conceal the face

noun: a protective covering worn over the face

noun: a party of guests wearing costumes and masks

verb: put a mask on or cover with a mask

"Mask the children for Halloween."

verb: shield from light

verb: cover with a sauce

"Mask the meat."

verb: hide under a false appearance

"He masked his disappointment."

verb: make unrecognizable

"The herb masks the garlic taste."