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Noun: intercalary 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, 366 days, bissextile year

Derived forms: intercalary years

Type of: twelvemonth, year, yr

Encyclopedia: Intercalary year