con·sti·tu·tive 
(kŏnstĭ-t′tĭv, -ty′-)
(kŏnstĭ-t′tĭv, -ty′-)adj.
1. Making a thing what it is; essential.
2. Having power to institute, establish, or enact.
3. Of or relating to the synthesis of a protein or an enzyme at a constant rate regardless of physiological demand or the concentration of a substrate.
consti·tu′tive·ly adv.