Dictionary
2 ENTRIES FOUND:

chain reaction

noun

: a series of events in which each event causes the next one : a series of events caused by one single event

: a chemical or nuclear change that causes other changes of the same kind to happen

Full Definition of CHAIN REACTION

1
a :  a series of events so related to each other that each one initiates the next
b :  a number of events triggered by the same initial event
2
:  a self-sustaining chemical or nuclear reaction yielding energy or products that cause further reactions of the same kind
chain–re·act \ˈchān-rē-ˈakt\ intransitive verb

Examples of CHAIN REACTION

  1. Increased oil prices could trigger a chain reaction in the economy.

First Known Use of CHAIN REACTION

circa 1902

chain reaction

noun    (Medical Dictionary)

Medical Definition of CHAIN REACTION

:  a self-sustaining chemical or nuclear reaction yielding energy or products that cause further reactions of the same kind

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