English to English
1. keep from happening or arising; make impossible
My sense of tact forbids an honest answer|Your role in the projects precludes your involvement in the competitive project
2. stop (someone or something) from doing something or being in a certain state
We must prevent the cancer from spreading|His snoring kept me from falling asleep|Keep the child from eating the marbles
3. To go before; to precede; hence, to go before as a guide; to direct.
4. To come before the usual time.