en·force 
(ĕn-fôrs)
(ĕn-fôrs)tr.v. en·forced, en·forc·ing, en·forc·es
1. To compel observance of or obedience to: enforce a law.
2. To impose (a kind of behavior, for example): enforce military discipline.
3. To give force to; reinforce: "enforces its plea with a description of the pains of hell" (Albert C. Baugh).
[Middle English enforcen, from Old French enforcier, to exert force, compel, and from enforcir, to strengthen : en-, causative pref.; see EN-1 + force, strength; see FORCE.]
en·forcea·bil′i·ty n.
en·forcea·ble adj.
en·forcement n.
en·forcer n.