Definition of cataclysmic adjective from the Oxford Advanced Learner's Dictionary

     

    cataclysmic

     adjective
    adjective
    BrE BrE//ˌkætəˈklɪzmɪk//
     
    ; NAmE NAmE//ˌkætəˈklɪzmɪk//
     
    [usually before noun](formal)
     
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  1. 1(of a natural event) causing sudden and violent change synonym catastrophic (1) a cataclysmic earthquake/flood/eruption
  2. 2extreme and very bad cataclysmic changes in society