'Generation' in the Bible

Jehovah is slow to anger, and abundant in goodness, forgiving iniquity and transgression, but by no means clearing the guilty, visiting the iniquity of the fathers upon the children, upon the third and fourth generation.

And Jehovah's anger was kindled against Israel, and he made them wander in the wilderness forty years, until the whole generation was consumed that had done evil in the eyes of Jehovah.