Dictionary.net

To go before; to precede; hence, to go before as a guide; to direct.

To be beforehand with; to anticipate.

To intercept; to hinder; to frustrate; to stop; to thwart.

To come before the usual time.

Preventable, preventible.

Preventer.

Prevention.

To stop in advance; hinder; check; restrain.

To take precautionary measures.

Preventable.

To stop or hinder, as the approach of a person, or the performance of something; to impede; to obstruct; in old usage, to go before; to anticipate.