- (a.) The next in order after seventy-ninth.
- (n.) The quotient of a unit divided by eighty; one of eighty equal parts.
- (a.) Consisting of one of eighty equal parts or divisions.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). eightieth. Retrieved September 21, 2026, from http://smartdefine.org/eightieth/definitions/2001915 |
| Chicago | Webster's. 2011. "eightieth" http://smartdefine.org/eightieth/definitions/2001915 (accessed September 21, 2026). |
| Harvard | Webster's 2011, eightieth, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/eightieth/definitions/2001915>. |
| MLA | Webster's. "eightieth" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/eightieth/definitions/2001915> |