- DictionaryLeap year/ˈlēp ˌyir/
noun
- 1. a year, occurring once every four years, that has 366 days including February 29 as an intercalary day.
noun
A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) added to keep the calendar year synchronized with the astronomical year or seasonal year. Wikipedia