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Meanings of intercalary month in English

Month added to a calendar in leap years.

Usage of intercalary month in English
1
He inserted the regular intercalary month of twenty-three days, and two additional ones of sixty-seven days.
Beacon Lights of History, Volume 03: Ancient Achievements
2
The letter dealing with the calendar was written to inform Sin-idinnam, the governor of Larsam, that an intercalary month was to be inserted.
History of Egypt, Chaldea, Syria, Babylonia, and Assyria in the ...
3
In this year the January with 29 and the February with 23 days were followed by the intercalary month with 28, and then by March.
The History of Rome, Book V / The Establishment of the Military ...
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