Source : Webster's Revised Unabridged Dictionary (1913)

Constitutive \Con"sti*tu`tive\, a.
   1. Tending or assisting to constitute or compose; elemental;
      essential.

            An ingredient and constitutive part of every virtue.
                                                  --Barrow.

   2. Having power to enact, establish, or create; instituting;
      determining. --Sir W. Hamilton.

Source : WordNet®

constitutive
     adj : constitutional in the structure of something (especially
           your physical makeup) [syn: {constituent(a)}, {constitutional},
            {constitutive(a)}, {organic}]