The Collaborative International Dictionary of English v.0.48:

Forge \Forge\, v. t. [imp. & p. p. Forged; p. pr. & vb. n.
   Forging.] [F. forger, OF. forgier, fr. L. fabricare,
   fabricari, to form, frame, fashion, from fabrica. See
   Forge, n., and cf. Fabricate.]
   1. To form by heating and hammering; to beat into any
      particular shape, as a metal.
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            Mars's armor forged for proof eterne. --Shak.
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   2. To form or shape out in any way; to produce; to frame; to
      invent.
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            Those names that the schools forged, and put into
            the mouth of scholars, could never get admittance
            into common use.                      --Locke.
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            Do forge a life-long trouble for ourselves.
                                                  --Tennyson.
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   3. To coin. [Obs.] --Chaucer.
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   4. To make falsely; to produce, as that which is untrue or
      not genuine; to fabricate; to counterfeit, as, a
      signature, or a signed document.
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            That paltry story is untrue,
            And forged to cheat such gulls as you. --Hudibras.
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            Forged certificates of his . . . moral character.
                                                  --Macaulay.

   Syn: To fabricate; counterfeit; feign; falsify.
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The Collaborative International Dictionary of English v.0.48:

Forging \For"ging\, n.
   1. The act of shaping metal by hammering or pressing.
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   2. The act of counterfeiting.
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   3. (Mach.) A piece of forged work in metal; -- a general name
      for a piece of hammered iron or steel.
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            There are very few yards in the world at which such
            forgings could be turned out.         --London
                                                  Times.
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WordNet (r) 3.0 (2006):

forging
    n 1: shaping metal by heating and hammering