payback

payback
    n 1: financial return or reward (especially returns equal to the
         initial investment)
    2: 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"--
       Romans 12:19; "For vengeance I would do nothing. This nation
       is too great to look for mere revenge"--James Garfield; "he
       swore vengeance on the man who betrayed him"; "the swiftness
       of divine retribution" [syn: {vengeance}, {retribution},
       {payback}]
    

payback \payback\ n.
   same as {retribution}. [informal]
   [PJC]

   2. same as {requital}. [informal]
      [PJC]