Longman Dictionary of Contemporary English homepage

chain reaction

 noun
     
Related topics: Chemistry, Physics
chain reaction [countable]
1 technical a chemical or nuclear reaction which produces energy and causes more reactions of the same kind
2 a series of related events, each of which causes the next:
A sudden drop on Wall Street can set off a chain reaction in other financial markets.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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