CERTAINTY, noun 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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI