critical mass

noun

Definition of critical mass

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

1919

First Known Use of critical mass

1919


CRITICAL MASS Defined for English Language Learners

critical mass

noun

Definition of critical mass for English Language Learners

  • : 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


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