Definition of nemesis noun from the Oxford Advanced Learner's Dictionary

     

    nemesis

     noun
    noun
    BrE BrE//ˈneməsɪs//
     
    ; NAmE NAmE//ˈneməsɪs//
     
    (pl. nemeses
    BrE BrE//ˈneməsi:z//
     
    ; NAmE NAmE//ˈneməsi:z//
     
    )
    (formal)
     
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  1. 1[countable] the person or thing that causes somebody to lose their power, position, etc. and that cannot be avoided Has she finally met her nemesis?
  2. 2[countable] a person or thing that has competed with somebody or been an enemy for a long time He strode out to face his old nemesis.
  3. 3 [uncountable, singular] punishment or defeat that is deserved and cannot be avoided This over-ambitious project eventually proved to be the company’s nemesis.
  4. Word Origin late 16th cent.: Greek, literally ‘retribution’, from nemein ‘give what is due’.
See the Oxford Advanced American Dictionary entry: nemesis