Source : Webster's Revised Unabridged Dictionary (1913)

Multiplicative \Mul"ti*pli*ca*tive\, a. [Cf. F. multiplicatif.]
   Tending to multiply; having the power to multiply, or incease
   numbers.

Source : WordNet®

multiplicative
     adj : tending or having the power to multiply or increase in
           number or quantity or degree; "the multiplicative
           tendency of proportional representation"