To compel observance of or obedience to: enforce a law.
To impose (a kind of behavior, for example): enforce military discipline.
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·force'a·bil'i·ty n., en·force'a·ble adj., en·force'ment n., en·forc'er n.