English word certainty comes from Latin certus (Certain. Fixed, settled, firm. Resolved, determined. Sure.)
| Dictionary entry | Language | Definition |
|---|---|---|
| certus | Latin (lat) | Certain. Fixed, settled, firm. Resolved, determined. Sure. |
| *certānitās | Vulgar Latin (la-vul) | |
| certeinete | Old French (fro) | |
| certeinte | Anglo-Norman (xno) | |
| certeynte | Middle English (enm) | |
| certainty | English (eng) | A fact or truth unquestionably established.. An instance of being certain.. The state of being certain. |