Definitions for "Prevent"
To intercept; to hinder; to frustrate; to stop; to thwart.
keep from happening or arising; have the effect of preventing; "My sense of tact forbids an honest answer"
To keep from happening, stop something before it starts.
Keywords:  beforehand, anticipate
To be beforehand with; to anticipate.
prevent 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"
Keywords:  precede, ahead, hence, english, guide
To go before; to precede; hence, to go before as a guide; to direct.
to go ahead of (early English); precede
Keywords:  come, time, usual
To come before the usual time.