- (a.) Continuing three years; as, triennial parliaments; a triennial reign.
- (n.) Something which takes place or appears once in three years.
- (a.) Happening, coming about or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). triennial. Retrieved September 24, 2026, from http://smartdefine.org/triennial/definitions/2074616 |
| Chicago | Webster's. 2011. "triennial" http://smartdefine.org/triennial/definitions/2074616 (accessed September 24, 2026). |
| Harvard | Webster's 2011, triennial, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/triennial/definitions/2074616>. |
| MLA | Webster's. "triennial" 28 May 2011. Web. 24 September 2026. <http://smartdefine.org/triennial/definitions/2074616> |