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critical mass

 
Noun critical mass has 2 senses
  1. critical mass - the minimum amount (of something) required to start or maintain a venture; "the battle for the computer market has now reached critical mass"; "there is now a critical mass of successful women to take the lead"; "they sold the business because it lacked critical mass"
    --1 is a kind of
    amount
  2. critical mass - the minimum mass of fissionable material that can sustain a chain reaction
    --2 is a kind of
    mass
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