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a year, occurring once every four years, which has 366 days including 29 February as an intercalary day.
A leap year is a year in which an extra day is added to the Gregorian calendar, which is used by most of the world. While an ordinary year has 365 days, aleap year has 366 days. ... A leap yearcomes once every four years. Because of this, a leap year can always be evenly divided by four.
A leap year is a calendar year containing one additional day added to keep the calendar year synchronized with the astronomical or seasonal year. ... A year that is not a leap year is called a common year.