Definition of “chain reaction” - English Dictionary

“chain reaction” in British English

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chain reactionnoun [ C ]

uk /ˌtʃeɪn riˈæk.ʃən/ us /ˌtʃeɪn riˈæk.ʃən/

(Definition of “chain reaction” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“chain reaction” in American English

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chain reactionnoun [ C ]

us /ˈtʃeɪn riˈæk·ʃən/

chain reaction noun [ C ] (SERIES OF EVENTS)

a set of related events in which each event causes the next one:

The accident caused a chain reaction in which seven trucks piled up on the bridge.

chain reaction noun [ C ] (NUCLEAR REACTION)

a series of nuclear reactions in which neutrons (= part of an atom) released by fission (= the dividing of an atom) go on to cause more fission

(Definition of “chain reaction” from the Cambridge Academic Content Dictionary © Cambridge University Press)