'Divisions' in the Bible

Now these are the people of the divisions of the kingdom, among those who had been made prisoners by Nebuchadnezzar, king of Babylon, and taken away to Babylon, who went back to Jerusalem and Judah, everyone to his town;

And they set the priests in their divisions, and the Levites in their courses, for the service of God, which is at Jerusalem; as it is written in the book of Moses.