(Nehemiah 6:15), the name of the sixth month of the ecclesiastical year, and the twelfth of the civil year. It began with the new moon of our August and September, and consisted of twenty-nine days.

Noah Webster's New International Dictionary of the English Language

(n.) The sixth month of the Jewish year, by the sacred reckoning, or the twelfth, by the civil reckoning, corresponding nearly to the month of September.