'Understood' in the Bible

And I, Daniel, was exhausted and was sick for [several] days. Afterward I got up and continued with the king’s business; but I was astounded at the vision, and there was no one who could explain it.

in the first year of his reign, I, Daniel, understood from the books the number of years which, according to the word of the Lord to Jeremiah the prophet, must pass before the desolations [which had been] pronounced on Jerusalem would end; and it was seventy years.

In the third year of Cyrus king of Persia a message was revealed to Daniel, who was named Belteshazzar; and the message was true and it referred to great conflict (warfare, misery). And he understood the message and had an understanding of the vision.