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Noun: bissextile year
  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
    - leap year, intercalary year, 366 days

Derived forms: bissextile years

Type of: twelvemonth, year, yr

Encyclopedia: Bissextile year