Definition of nemesis noun from the Oxford Advanced American Dictionary

     

    nemesis

     noun
    noun
    NAmE//ˈnɛməsəs//
     
    (pl. nemeses
    NAmE//ˈnɛməsiz//
     
    )
     
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  1. 1[countable] a person or a thing that is very difficult to defeat Will Harry Potter finally defeat his nemesis, Voldemort? Injury, always his nemesis, struck him down during the match.
  2. 2[uncountable] (formal) punishment or defeat that is deserved and cannot be avoided
See the Oxford Advanced Learner's Dictionary entry: nemesis