- (a.) Constituting one of forty equal parts into which anything is divided.
- (a.) Following the thirty-ninth or preceded by thirty-nine units, things or parts.
- (n.) One of forty equal parts into which one whole is divided; the quotient of a unit divided by forty; one next in order after the thirty-ninth.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). fortieth. Retrieved September 22, 2026, from http://smartdefine.org/fortieth/definitions/2009739 |
| Chicago | Webster's. 2011. "fortieth" http://smartdefine.org/fortieth/definitions/2009739 (accessed September 22, 2026). |
| Harvard | Webster's 2011, fortieth, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/fortieth/definitions/2009739>. |
| MLA | Webster's. "fortieth" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/fortieth/definitions/2009739> |