definition of
mask

[1] #1 mask n. a covering to disguise or conceal the face. wn

[2] #2 mask v. [dissemble, cloak] hide under a false appearance; "He masked his disappointment". wn

[3] #3 mask n. activity that tries to conceal something; "no mask could conceal his ignorance"; "they moved in under a mask of friendship". wn

[4] #4 mask v. put a mask on or cover with a mask; "Mask the children for Halloween". wn

[5] #5 mask n. [masquerade, masquerade party, masque] a party of guests wearing costumes and masks. wn