Possible Definitions:
1. Prevent (v. t.) To go before; to precede; hence, to go before as a guide; to direct.
2. Prevent (v. t.) To be beforehand with; to anticipate.
3. Prevent (v. t.) To intercept; to hinder; to frustrate; to stop; to thwart.
4. Prevent (v. i.) To come before the usual time.
