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Webster's New World College Dictionary » critical mass
critical mass 
critical mass definition
critical mass
- the minimum amount of fissile material that can sustain a nuclear chain reaction under a given set of conditions
- the minimum amount or number required for something to happen, begin, etc.
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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