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Verb: prevent  pri'vent
  1. Keep from happening or arising; make impossible
    "Your role in the projects prevents your involvement in the competitive project";
    - forestall, foreclose, preclude, forbid
     
  2. Stop (someone or something) from doing something or being in a certain state
    "We must prevent the cancer from spreading";
    - keep

Derived forms: prevented, prevents, preventing

Antonym: let

Encyclopedia: Prevent