'Generation' in the Bible

"But to what shall I compare this generation? It is like children sitting in the marketplaces who call out to one another,

But he answered [and] said to them, "An evil and adulterous generation desires a sign, and no sign will be given to it except the sign of the prophet Jonah!

The people of Nineveh will stand up at the judgment with this generation and condemn it, because they repented at the proclamation of Jonah, and behold, [something] greater than Jonah [is] here!

The queen of the south will rise up at the judgment with this generation and condemn it, because she came from the ends of the earth to hear the wisdom of Solomon, and behold, [something] greater than Solomon [is] here!

Then it goes and brings along with itself seven other spirits more evil than itself, and [they] go in [and] live there. And the last [state] of that person becomes worse than the first. So it will be for this evil generation also!"

An evil and adulterous generation seeks for a sign, and a sign will not be given to it except the sign of Jonah!" And he left them [and] went away.

And Jesus answered [and] said, "O unbelieving and perverse generation! {How long} will I be with you? {How long} must I put up with you? Bring him here to me!"

Truly I say to you, all these [things] will come upon this generation!

Truly I say to you that this generation will never pass away until all these [things] take place!