'Generation' in the Bible

And he sighed deeply in his spirit, and saith, Why doth this generation seek a sign? verily I say unto you, There shall no sign be given unto this generation.

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

And he answereth them and saith, O faithless generation, how long shall I be with you? how long shall I bear with you? bring him unto me.

Verily I say unto you, This generation shall not pass away, until all these things be accomplished.