Wordnet 3.0
ADJECTIVE (1)
1. 
 tending or having the power to multiply or increase in number or quantity or degree; 
- Example: "the multiplicative tendency of proportional representation"
The Collaborative International Dictionary of English v.0.48:
Multiplicative \Mul"ti*pli*ca*tive\, a. [Cf. F. multiplicatif.]
   Tending to multiply; having the power to multiply, or incease
   numbers.
   [1913 Webster]
WordNet (r) 3.0 (2006):
multiplicative
    adj 1: tending or having the power to multiply or increase in
           number or quantity or degree; "the multiplicative
           tendency of proportional representation"