Dictionary

critical mass

noun

: an amount of material (such as plutonium) that is large enough to allow a nuclear reaction to occur

: the size, number, or amount of something that is needed to cause a particular result

Full Definition of CRITICAL MASS

:  a size, number, or amount large enough to produce a particular result <the critical mass of activity needed for a retail store>

First Known Use of CRITICAL MASS

1919

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May 30, 2015
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