'Third' in the Bible

it happened on the third day, that behold, a man came out of the camp from Saul, with his clothes torn, and earth on his head: and so it was, when he came to David, that he fell to the earth, and did obeisance.

and his second, Chileab, of Abigail the wife of Nabal the Carmelite; and the third, Absalom the son of Maacah the daughter of Talmai king of Geshur;

David sent forth the people, a third part under the hand of Joab, and a third part under the hand of Abishai the son of Zeruiah, Joab's brother, and a third part under the hand of Ittai the Gittite. The king said to the people, "I will surely go forth with you myself also."