critical mass definition, meaning - what is critical mass in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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critical mass

noun [C usually singular or U] uk   us  
specialized physics the smallest amount of matter that is needed to produce a nuclear chain reaction the size that something needs to reach before a particular change, event, or development can happen
(Definition of critical mass from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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