noun (n)

• the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life(noun.act)

  Example:
  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.
  

  Synonym:
  payback, retribution
  

  source: wordnet30
• Punishment inflicted in return for an injury or an offense; retribution; -- often, in a bad sense, passionate or unrestrained revenge.(noun)

  source: webster1913