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

chain reaction

noun
 
/ˌtʃeɪn riˈækʃn/
 
/ˌtʃeɪn riˈækʃn/
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  1. (chemistry, physics) a chemical or nuclear change that forms products that themselves cause more changes and new products
  2. a series of events, each of which causes the next
    • It set off a chain reaction in the international money markets.
    • The change of plan set off a chain reaction of confusion.
See chain reaction in the Oxford Advanced American DictionarySee chain reaction in the Oxford Learner's Dictionary of Academic English
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