'Formal' in the Bible

So now, come, let's make a formal agreement, you and I, and it will be proof that we have made peace."

All the people, rulers, leaders, and judges were standing on either side of the ark, in front of the Levitical priests who carried the ark of the covenant of the Lord. Both resident foreigners and native Israelites were there. Half the people stood in front of Mount Gerizim and the other half in front of Mount Ebal, as Moses the Lord's servant had previously instructed to them to do for the formal blessing ceremony.

Don't you realize that the Lord God of Israel has given David and his dynasty lasting dominion over Israel by a formal agreement?

Then the Jewish leaders were astonished and said, "How does this man know so much when he has never had formal instruction?"

After five days the high priest Ananias came down with some elders and an attorney named Tertullus, and they brought formal charges against Paul to the governor.

So the chief priests and the most prominent men of the Jews brought formal charges against Paul to him.