- (a.) Of or pertaining to a profession or calling; conforming to the rules or standards of a profession; following a profession; as, professional knowledge; professional conduct.
- (a.) Engaged in by professionals; as, a professional race; -- opposed to amateur.
- (n.) A person who prosecutes anything professionally or for a livelihood, and not in the character of an amateur; a professional worker.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). professional. Retrieved September 20, 2026, from http://smartdefine.org/professional/definitions/2049577 |
| Chicago | Webster's. 2011. "professional" http://smartdefine.org/professional/definitions/2049577 (accessed September 20, 2026). |
| Harvard | Webster's 2011, professional, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/professional/definitions/2049577>. |
| MLA | Webster's. "professional" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/professional/definitions/2049577> |