- (a.) Happening or taking place, once in two years; as, a biennial election.
- (n.) Something which takes place or appears once in two years; especially a biennial examination.
- (a.) Continuing for two years, and then perishing, as plants which form roots and leaves the first year, and produce fruit the second.
- (n.) A plant which exists or lasts for two years.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). biennial. Retrieved September 23, 2026, from http://smartdefine.org/biennial/definitions/1980169 |
| Chicago | Webster's. 2011. "biennial" http://smartdefine.org/biennial/definitions/1980169 (accessed September 23, 2026). |
| Harvard | Webster's 2011, biennial, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/biennial/definitions/1980169>. |
| MLA | Webster's. "biennial" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/biennial/definitions/1980169> |