Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

assimilative
     adj : tending to or characterized by or causing assimilation
           (being absorbed into or incorporated); "an assimilative
           pattern"; "an assimilative process" [syn: {assimilating},
            {assimilatory}]