financial return or reward (especially returns equal to the initial investment)
"The stock's impressive growth over the last decade has finally provided me with a solid payback for my initial savings."
the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life
"Vengeance is mine; I will repay, saith the Lord"
"For vengeance I would do nothing. This nation is too great to look for mere revenge"
"he swore vengeance on the man who betrayed him"
"the swiftness of divine retribution"
An act of revenge.
"He finally got his payback when the rival shop started selling counterfeit goods instead of quality items."