Source : Webster's Revised Unabridged Dictionary (1913)

Counterfeit \Coun"ter*feit\ (koun"t?r-f?t), a. [F. contrefait,
   p. p. of contrefaire to counterfeit; contre (L. contra) +
   faire to make, fr. L. facere. See {Counter}, adv., and
   {Fact}.]
   1. Representing by imitation or likeness; having a
      resemblance to something else; portrayed.

            Look here upon this picture, and on this- The
            counterfeit presentment of two brothers. --Shak.

   2. Fabricated in imitation of something else, with a view to
      defraud by passing the false copy for genuine or original;
      as, counterfeit antiques; counterfeit coin. ``No
      counterfeit gem.'' --Robinson (More's Utopia).

   3. Assuming the appearance of something; false; spurious;
      deceitful; hypocritical; as, a counterfeit philanthropist.
      ``An arrant counterfeit rascal.'' --Shak.

   Syn: Forged; fictitious; spurious; false.

Counterfeit \Coun"ter*feit\, v. t. [imp. & p. p.
   {Counterfeited}; p. pr. & vb. n. {Counterfeiting}.]
   1. To imitate, or put on a semblance of; to mimic; as, to
      counterfeit the voice of another person.

            Full well they laughed with counterfeited glee At
            all his jokes, for many a joke had he. --Goldsmith.

   2. To imitate with a view to deceiving, by passing the copy
      for that which is original or genuine; to forge; as, to
      counterfeit the signature of another, coins, notes, etc.

Counterfeit \Coun"ter*feit\, n.
   1. That which resembles or is like another thing; a likeness;
      a portrait; a counterpart.

            Thou drawest a counterfeit Best in all Athens.
                                                  --Shak.

            Even Nature's self envied the same, And grudged to
            see the counterfeit should shame The thing itself.
                                                  --Spenser.

   2. That which is made in imitation of something, with a view
      to deceive by passing the false for the true; as, the bank
      note was a counterfeit.

            Never call a true piece of gold a counterfeit.
                                                  --Shak.

            Some of these counterfeits are fabricated with such
            exquisite taste and skill, that it is the
            achievement of criticism to distinguish them from
            originals.                            --Macaulay.

   3. One who pretends to be what he is not; one who personates
      another; an impostor; a cheat.

            I fear thou art another counterfeit; And yet, in
            faith, thou bear'st thee like a king. --Shak.

Counterfeit \Coun"ter*feit\, v. i.
   1. To carry on a deception; to dissemble; to feign; to
      pretend.

            The knave counterfeits well; a good knave. --Shak.

   2. To make counterfeits.

Source : WordNet®

counterfeit
     adj : not genuine; imitating something superior; "counterfeit
           emotion"; "counterfeit money"; "counterfeit works of
           art"; "a counterfeit prince" [syn: {imitative}] [ant: {genuine}]

counterfeit
     n : a copy that is represented as the original [syn: {imitation},
          {forgery}]
     v : make a copy of with the intent to deceive; "he faked the
         signature"; "they counterfeited dollar bills"; "She
         forged a Green Card" [syn: {forge}, {fake}]