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English definition of “critical mass”

critical mass

noun [U or S]    
the size or number that something needs to reach before a particular change or development can happen: They believe that they have achieved critical mass, that is a size that is necessary for the company to survive. The challenge is to attract a critical mass of customers that will enable the business to start making a profit.
(Definition of critical mass noun from the Cambridge Business English Dictionary © Cambridge University Press)
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