- (a.) Lasting or comprising twenty years.
- (a.) Happening once in twenty years; as, a vicennial celebration.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). vicennial. Retrieved September 21, 2026, from http://smartdefine.org/vicennial/definitions/2079558 |
| Chicago | Webster's. 2011. "vicennial" http://smartdefine.org/vicennial/definitions/2079558 (accessed September 21, 2026). |
| Harvard | Webster's 2011, vicennial, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/vicennial/definitions/2079558>. |
| MLA | Webster's. "vicennial" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/vicennial/definitions/2079558> |