Merriam-Webster Collegiate Dictionary - revenge

 I. transitive verb  (~d; revenging)  Etymology: Middle English, from Anglo-French ~r, revengier, from re- + venger to avenge — more at vengeance  Date: 14th century  1. to avenge (as oneself) usually by retaliating in kind or degree  2. to inflict injury in return for ~ an insult  • ~r noun  II. noun  Etymology: Middle French ~, revenche, from revengier, revenchier to ~  Date: circa 1547  1. a desire for ~ motivated by ~  2. an act or instance of retaliating in order to get even plotted her ~  3. an opportunity for getting satisfaction sought ~ through a rematch