1. To strengthen (a castle, town etc.) with extra troops, fortifications etc.
  2. To intensify, make stronger, add force to.
  3. To exert oneself, to try hard.
  4. To give strength or force to; to affirm, to emphasize.
    The victim was able to enforce his evidence against the alleged perpetrator.
  5. To compel, oblige (someone or something); to force.
  6. To keep up, impose or bring into effect something, not necessarily by force.
    The police are there to enforce the law.
  7. To make or gain by force; to force.
    to enforce a passage
  8. To put in motion or action by violence; to drive.
  9. To give force to; to strengthen; to invigorate; to urge with energy.
    to enforce arguments or requests
  10. To urge; to ply hard; to lay much stress upon.
  11. To prove; to evince.

The above text is a snippet from Wiktionary: enforce
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