1. 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.

2. Full assurance of mind; exemption from doubt.

Certainty is the perception of the agreement or disagreement of our ideas.

3. 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.

4. Regularity; settled state.