'Once' in the Bible

So the LORD left those nations, not driving them out at once, and he did not give them into the power of Joshua.

Then Gideon said to God, "Let not thy anger burn against me, let me speak but this once; pray, let me make trial only this once with the fleece; pray, let it be dry only on the fleece, and on all the ground let there be dew."

The trees once went forth to anoint a king over them; and they said to the olive tree, 'Reign over us.'

When Deli'lah saw that he had told her all his mind, she sent and called the lords of the Philistines, saying, "Come up this once, for he has told me all his mind." Then the lords of the Philistines came up to her, and brought the money in their hands.

Then Samson called to the LORD and said, "O Lord GOD, remember me, I pray thee, and strengthen me, I pray thee, only this once, O God, that I may be avenged upon the Philistines for one of my two eyes."