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English definition of “chain reaction”

chain reaction

noun [C]    
a set of related events in which each event causes the next one, or a chemical reaction in which each change causes another: The war risked setting off a perilous chain reaction that would endanger the whole world.Order and sequenceSimultaneous and consecutiveReacting and responding
(Definition of chain reaction noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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