- Applied to knowledge and conceptions assumed or presupposed, as prior to experience, in order to make experience rational or possible.
- Characterizing that kind of reasoning which deduces consequences from definitions formed or principles assumed or which infers effects from causes previously known; deductive or deductively. The reverse of a posteriori.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). a priori. Retrieved September 26, 2026, from http://smartdefine.org/a_priori/definitions/1969479 |
| Chicago | Webster's. 2011. "a priori" http://smartdefine.org/a_priori/definitions/1969479 (accessed September 26, 2026). |
| Harvard | Webster's 2011, a priori, Smart Define, viewed 26 September, 2026, <http://smartdefine.org/a_priori/definitions/1969479>. |
| MLA | Webster's. "a priori" 27 May 2011. Web. 26 September 2026. <http://smartdefine.org/a_priori/definitions/1969479> |