'Generation' in the Bible

Jehovah is slow to anger, and of great kindness; bearing away iniquity and transgression, and not entirely acquitting, charging iniquity of fathers on sons, on a third generation, and on a fourth; --

and the anger of Jehovah burneth against Israel, and He causeth them to wander in the wilderness forty years, until the consumption of all the generation which is doing the evil thing in the eyes of Jehovah.