'Affinity' in the Bible

And Solomon made affinity with Pharaoh king of Egypt, and took Pharaoh's daughter, and brought her into the city of David, until he had made an end of building his own house, and the house of Jehovah, and the wall of Jerusalem round about.

Now Jehoshaphat had riches and honor in abundance; and he joined affinity with Ahab.

shall we again break thy commandments, and join in affinity with the peoples that do these abominations? wouldest not thou be angry with us till thou hadst consumed us, so that there should be no remnant, nor any to escape?