A fixed or real state; truth; fact. Know for a certainty, that the Lord your God will no more drive out these nations. Joshua 23:13; Luke 1:4.

Full assurance of mind; exemption from doubt. Certainty is the perception of the agreement or disagreement of our ideas.

Exemption from failure; as the certainty of an event, or of the success of a medicine. The certainty of punishment is the truest security against crimes.

Regularity; settled state.