1. [n]  making a false outward show; "a beggar's masquerade of wealth"
2. [n]  a costume worn as a disguise at a masquerade party
3. [n]  a party of guests wearing costumes and masks
4. [v]  pretend to be someone or something that you are not; "he is masquerading as the expert on th Internet"; "This silly novel is masquerading as a serious historical treaty"
5. [v]  take part in a masquerade

Masquerade
A woman awakens in an unfamiliar room, uncertain of her identity. According to the handsome man attending her, she is Elizabeth Sansborough, taughtly trained CIA operative, and he is her lover. None of it sounds remotely familiar to her, and after gaining access to secret files, the mystery woman begins to think she might be someone else. She escapes and begins to search for her identity and the truth behind the loss of it. The quest is a dangerous globetrotting mission that takes her into the world of mind-erasing drugs and grand scale economic espionage.

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1. \Mas`quer*ade"\, n. [F. mascarade, fr. Sp. mascarada,
   or It. mascherata. See {Mask}.]
   1. An assembly of persons wearing masks, and amusing
      themselves with dancing, conversation, or other
      diversions.
            In courtly balls and midnight masquerades. --Pope.
   2. A dramatic performance by actors in masks; a mask. See 1st
      {Mask}, 4. [Obs.]
   3. 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.
   4. A Spanish diversion on horseback.
   

2. \Mas`quer*ade"\, v. i. [imp. & p. p. {Masqueraded};
   p. pr. & vb. n. {Masquerading}.]
   1. To assemble in masks; to take part in a masquerade.
   2. 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.
   

3. \Mas`quer*ade"\, v. t.
   To conceal with masks; to disguise. ``To masquerade vice.''
   --Killingbeck.