Payback (noun)

1. The act of repaying a debt or a loan.
2. The act of taking revenge or getting even with someone.
3. The act of returning the favor or making amends for something.

Origin:

From the verb pay back, meaning to repay a debt or to take revenge, which comes from the old english word paegian (to pacify or make peace).

Examples:

1. He finally paid back the loan he had borrowed from the bank.
2. He felt a sense of payback when he finally won the lawsuit.
3. He was determined to get payback for what had been done to him.
4. The payback for the investment was much higher than expected.
5. The payback for her kindness was an outpouring of love and support.