'Generation' in the Bible

And groaning in his spirit, he says, Why does this generation seek a sign? Verily I say unto you, A sign shall in no wise be given to this generation.

For whosoever shall be ashamed of me and of my words in this adulterous and sinful generation, of him shall the Son of man also be ashamed when he shall come in the glory of his Father with the holy angels.

But he answering them says, O unbelieving generation! how long shall I be with you? how long shall I bear with you? bring him to me.

Verily I say unto you, This generation shall in no wise pass away, till all these things take place.