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Definition of chain reaction noun from the Oxford Advanced American Dictionary

     

    chain reaction

     noun
    noun
     
     
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  1. 1(chemistry) (physics) a chemical or nuclear change that forms products which themselves cause more changes and new products
  2. 2a series of events, each of which causes the next It set off a chain reaction in the international money markets.
See the Oxford Advanced Learner's Dictionary entry: chain reaction