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intercalary
01
(of a day or month) added to a calendar to align it with the solar year or another astronomical cycle
intercalary
adj
Example
The intercalary day in a leap year helps synchronize the calendar with Earth's orbit around the Sun.
During certain years, an intercalary month is inserted to maintain the accuracy of the lunisolar calendar.
Some cultures include an intercalary month to keep their lunar calendars aligned with the solar year.
