Vous avez cherché: certainty (Anglais - Latin)

certainty
salutis

with absolute certainty
cum certitudine absoluta

the certainty of salvation
certitudo fidei

to disclose fully, find out with certainty
comperio

certitudo, certitudinis certainty, certitude; assurance (bee); truth;
certitudinis

that thou mightest know the certainty of those things, wherein thou hast been instructed.
ut cognoscas eorum verborum de quibus eruditus es veritate

the king answered and said, i know of certainty that ye would gain the time, because ye see the thing is gone from me.
respondit rex et ait certo novi quia tempus redimitis scientes quod recesserit a me serm

that i might make thee know the certainty of the words of truth; that thou mightest answer the words of truth to them that send unto thee?
ut ostenderem tibi firmitatem et eloquia veritatis respondere ex his illi qui misit t

compertum, comperti ascertained/proved/verified fact, certainty; [pro ~o => as certain/for a fact];
comperti