The Collaborative International Dictionary of English v.0.48:

integrative \integrative\ adj.
   1. tending to combine and coordinate diverse elements into a
      whole. [Narrower terms: consolidative, unifying;
      plastic )] Also See: collective, combinative,
      integrated. Antonym: disintegrative.
      [WordNet 1.5]

   2. centralizing(prenominal). Opposite of decentralizing.

   Syn: consolidative.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

integrative
    adj 1: combining and coordinating diverse elements into a whole
           [ant: disintegrative]
    2: tending to consolidate [syn: consolidative, integrative]