Definition of chain reaction noun from the Oxford Advanced Learner's Dictionary


    chain reaction

    BrE BrE//ˌtʃeɪn riˈækʃn//
    ; NAmE NAmE//ˌtʃeɪn riˈækʃn//
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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 American Dictionary entry: chain reaction