Source : Webster's Revised Unabridged Dictionary (1913)

Badge \Badge\, n. [LL. bagea, bagia, sign, prob. of German
   origin; cf. AS. be['a]g, be['a]h, bracelet, collar, crown, OS
   b?g- in comp., AS. b?gan to bow, bend, G. biegen. See {Bow}
   to bend.]
   1. A distinctive mark, token, sign, or cognizance, worn on
      the person; as, the badge of a society; the badge of a
      policeman. ``Tax gatherers, recognized by their official
      badges. '' --Prescott.

   2. Something characteristic; a mark; a token.

            Sweet mercy is nobility's true badge. --Shak.

   3. (Naut.) A carved ornament on the stern of a vessel,
      containing a window or the representation of one.

Badge \Badge\, v. t.
   To mark or distinguish with a badge.

Source : WordNet®

badge
     v : put a badge on; "The workers here must be badged"

badge
     n 1: an emblem (a small piece of plastic or cloth or metal) that
          signifies your status (rank or membership or affiliation
          etc.); "they checked everyone's badge before letting
          them in"
     2: any feature that is regarded as a sign of status (a
        particular power or quality or rank); "wearing a tie was
        regarded as a badge of respectability"