1. In the Gregorian calendar, a year with 366 days including 29th February; usually any year divisible by 4 is a leap year, with the exception that centenary years are not leap years unless divisible by 400
   "2024 will be a leap year"; "2020 was a leap year with 366 days";
   - intercalary year, 366 days, bissextile year

Derived forms: leap years

Type of: twelvemonth [archaic], year, yr

Encyclopedia: Leap year