Agent noun of prevail; one who prevails.

plural of prevailer

Before a vaccine, or before the use of vaccines generally.

The quality of being prevailing.

In front of a vacuole / Relating to a prevacuole

vaccinated prior to some other treatment

plural of prevailment

War started by one of the parties without having received any attack from the other party. This type of war is initiated by states unable to use diplomacy

It is better to prevent a disease than to have to cure it. / (idiomatic, by extension) Precaution and prevention of an undesirable thing is preferable to dealing with its potential consequences.

(rare) Alternative form of an ounce of prevention is better than a pound of cure