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subcritical

[suhb-krit-i-kuh l] /sʌbˈkrɪt ɪ kəl/
adjective
1.
Physics. pertaining to a state, value, or quantity that is less than critical, especially to a mass of radioactive material.
2.
being of less than critical importance.
Origin
1940-1945
1940-45; sub- + critical
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sub critical

subcritical

/sʌbˈkrɪtɪkəl/
adjective
1.
(physics) (of a nuclear reaction, power station, etc) having or involving a chain reaction that is not self-sustaining; not yet critical
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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