1. 
2. 
[syn: assimilating, assimilative, assimilatory]
The Collaborative International Dictionary of English v.0.48:
Assimilative \As*sim"i*la*tive\, a. [Cf. LL. assimilativus, F.
   assimilatif.]
   Tending to, or characterized by, assimilation; that
   assimilates or causes assimilation; as, an assimilative
   process or substance.
   [1913 Webster]
WordNet (r) 3.0 (2006):
assimilative
    adj 1: capable of mentally absorbing ; "assimilative processes",
           "assimilative capacity of the human mind"
    2: capable of taking (gas, light, or liquids) into a solution;
       "an assimilative substance [syn: assimilating,
       assimilative, assimilatory]