'Generation' in the Bible

Then the Lord said to Noah, “Enter the ark, you and all your household, for I have seen that you alone are righteous before Me in this generation.

In the fourth generation they will return here, for the iniquity of the Amorites has not yet reached its full measure.”

He saw Ephraim’s sons to the third generation; the sons of Manasseh’s son Machir were recognized by Joseph.