Adar

Fausset's Bible Dictionary

Hebrew Αddar . (See Addar ). Southern boundary of Judah and the Holy Land, called also Hazar-Addar:  Joshua 15:3. (See Hazar -ADDAR).

International Standard Bible Encyclopedia

ā -´ dar ( אדר , 'ădhār , meaning uncertain): The Babylonian name of the twelfth month of the year. Used in the Bible only in  Ezra 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.