Source : Webster's Revised Unabridged Dictionary (1913)

Multiplier \Mul"ti*pli`er\, n. [Cf. F. multiplier. Cf.
   {Multiplicator}.]
   1. One who, or that which, multiplies or increases number.

   2. (Math.) The number by which another number is multiplied.
      See the Note under {Multiplication}.

   3. (Physics) An instrument for multiplying or increasing by
      repetition or accumulation the intensity of a force or
      action, as heat or electricity. It is particularly used to
      render such a force or action appreciable or measurable
      when feeble. See {Thermomultiplier}.

Source : WordNet®

multiplier
     n : the number by which a multiplicand is multiplied [syn: {multiplier
         factor}]