Source : Webster's Revised Unabridged Dictionary (1913)

Forgery \For"ger*y\, n.; pl. {Forgeries}. [Cf. F. forgerie.]
   1. The act of forging metal into shape. [Obs.]

            Useless the forgery Of brazen shield and spear.
                                                  --Milton.

   2. The act of forging, fabricating, or producing falsely;
      esp., the crime of fraudulently making or altering a
      writing or signature purporting to be made by another; the
      false making or material alteration of or addition to a
      written instrument for the purpose of deceit and fraud;
      as, the forgery of a bond. --Bouvier.

   3. That which is forged, fabricated, falsely devised, or
      counterfeited.

            These are the forgeries of jealously. --Shak.

            The writings going under the name of Aristobulus
            were a forgery of the second century. --Waterland.

   Syn: {Counterfeit}; {Forgery}.

   Usage: Counterfeit is chiefly used of imitations of coin, or
          of paper money, or of securities depending upon
          pictorial devices and engraved designs for identity or
          assurance of genuineness. Forgery is more properly
          applied to making a false imitation of an instrument
          depending on signatures to show genuineness and
          validity. --Abbott.

Source : WordNet®

forgery
     n 1: a copy that is represented as the original [syn: {imitation},
           {counterfeit}]
     2: criminal falsification by making or altering an instrument
        with intent to defraud