The Collaborative International Dictionary of English v.0.48:

Chevalier \Che`va*lier"\, n. [F., fr. LL. caballarius. See
   Cavaller.]
   1. A horseman; a knight; a gallant young man. "Mount,
      chevaliers; to arms." --Shak.
      [1913 Webster]

   2. A member of certain orders of knighthood.
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   Chevalier d'industrie[F.], one who lives by persevering
      fraud; a pickpocket; a sharper.

   The Chevalier St. George (Eng. Hist.), James Francis Edward
      Stuart (son of James II.), called "The Pretender."

   The Young Chevalier, Charles Edward Stuart, son of the
      Chevalier St. George.
      [1913 Webster]