'Third' in the Bible

On the third day a man came from Saul's tents, with his clothing out of order and earth on his head: and when he came to David, he went down on the earth and gave him honour.

And the second, Chileab, whose mother was Abigail, the wife of Nabal the Carmelite; and the third, Absalom, son of Maacah, the daughter of Talmai, king of Geshur;

And David sent the people out, a third of them under the orders of Joab, and a third under the orders of Abishai, son of Zeruiah, Joab's brother, and a third under Ittai the Gittite. And the king said to the people, And I myself will certainly go out with you.