Bissextile; a year containing 366 days; every fourth year which leaps over a day more than a common year, giving to February twenty-nine days. See Bissextile.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). leap year. Retrieved September 25, 2026, from http://smartdefine.org/leap_year/definitions/2027081 |
| Chicago | Webster's. 2011. "leap year" http://smartdefine.org/leap_year/definitions/2027081 (accessed September 25, 2026). |
| Harvard | Webster's 2011, leap year, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/leap_year/definitions/2027081>. |
| MLA | Webster's. "leap year" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/leap_year/definitions/2027081> |