See Also: critical mass(medicine)
critical mass(encyclopedia)
critical mass(dictionary)
critical(dictionary)
Critical(money)
critical(dictionary)
critical pH(medicine)
Critical(medicine)
critical rate(medicine)
critical pressure(medicine)

critical mass (oh)



n [U and C]
the amount of a substance that is necessary for a nuclear chain reaction to start
the smallest number of people or things that are needed in order for something to happen or be possible
::How can we get a critical mass of people involved to keep the club running?