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WordNet (r) 3.0 (2006) (WordNet)

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" [synonym: {vengeance}, {retribution},
{payback}]