verb (v)

• keep from happening or arising; make impossible(verb.social)

  Synonym:
  forbid, foreclose, forestall, preclude
  

  source: wordnet30
• stop (someone or something) from doing something or being in a certain state(verb.social)

  Example:
  We must prevent the cancer from spreading.
  

  Synonym:
  keep
  Antonym:
  allow, let, permit
  

  source: wordnet30
• To go before; to precede; hence, to go before as a guide; to direct.(verb)

  source: webster1913
• To come before the usual time.(verb)

  source: webster1913