Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
- less than critical
- unable to sustain a fission chain reaction: said of a nuclear reactor, device, etc.
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- Having a mass of fissionable material that is less than that needed for a chain reaction.
- Of less than critical importance.