1. keep from happening or arising; make impossible

- Your role in the projects precludes your involvement in the competitive project

Similar word(s): forbid, foreclose, forestall, preclude

Definition categories: social

2. stop (someone or something) from doing something or being in a certain state

- We must prevent the cancer from spreading

Similar word(s): keep

Definition categories: social

Sentences with prevent as a verb:

- I brushed my teeth to prevent them from going yellow.