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ADAR (ā'dar, Heb. ’āddār) The twelfth month of the calendar used by the Israelites after the Exile. It is roughly equivalent to mid-February to mid-March. See also Calendar.

ADAR ā’ där (אֲדָ֑ר). 1. The twelfth month in the Babylonian calendar used by postexilic Israel. When necessary because of the lunar year, a second intercalary Adar was used (Ezra 6:15; Esth 3:7, 13; 8:12; 9:1, 15-21. Occurs also in 1 and 2 Macc and in Add Esth).

2. KJV (Josh 15:3) alternate form of Addar. See Calendar.

International Standard Bible Encyclopedia (1915)

The Babylonian name of the twelfth month of the year. Used in the Bible only in Ezr 6:15 and eight times in Esther. At first the author in Esther defines Adar as the twelfth month, but afterward omits the numeral. In order to maintain the relation of the year to the seasons it was customary to add a second Adar, as often as was needed, as an intercalary month.

a’-dar: In the King James Version (Jos 15:3) for ADDAR, which see.