Adar was the twelfth month of the Jewish ecclesiastical year and the sixth month of the civil year. It extended approximately from the new moon of March to the new moon of April.
Adar is named in Esther in connection with the decree against the Jews and the events surrounding their deliverance.
The name came into use after the Captivity. When the season was late and the lambs or barley were not ready for Passover, a second Adar, called Veadar, was added. Adar was also the name of a place on Judah’s southern boundary.