'Generation' in the Bible

"I swear that not one man of this evil generation will see the good land that I promised to give to your ancestors,

Now from the time we left Kadesh-barnea until we crossed the Wadi Zered was 38 years. All of that generation, the soldiers in the camp, were destroyed just as the LORD swore they would be.

You are not to bow down to them in worship or serve them, because I, the LORD your God, am a jealous God, visiting the guilt of parents on children, to the third and fourth generation of those who hate me,

Know that the LORD your God is God, the trusted God who faithfully keeps his covenant to the thousandth generation of those who love him and obey his commands.

Furthermore, no one born due to an illicit sexual relationship may participate in the assembly of the LORD, including his descendants to the tenth generation.

No Ammonite or Moabite may participate in the assembly of the LORD, and none of their descendants shall be admitted to the assembly of the LORD, to the tenth generation,

"Then the generation to come your descendants after you and the foreigners who come from afar will see plagues and illnesses infecting the land that the LORD will inflict on it.

But those who are not his children acted corruptly against him; they are a defective and perverted generation.

So he said: "Let me hide my face from them. I will observe what their end will be, because they are a perverted generation, children within whom there is no loyalty.