Source : Webster's Revised Unabridged Dictionary (1913)

Incorporative \In*cor"po*ra*tive\, a.
   Incorporating or tending to incorporate; as, the
   incorporative languages (as of the Basques, North American
   Indians, etc. ) which run a whole phrase into one word.

         History demonstrates that incorporative unions are
         solid and permanent; but that a federal union is weak.
                                                  --W. Belsham.

Source : WordNet®

incorporative
     adj : growing by taking over and incorporating adjacent
           territories; "the Russian Empire was a typical
           incorporative state"