critical

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critical

1. Informal so seriously injured or ill as to be in danger of dying
2. Physics of, denoting, or concerned with a state in which the properties of a system undergo an abrupt change
3. go critical (of a nuclear power station or reactor) to reach a state in which a nuclear-fission chain reaction becomes self-sustaining
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

critical

[′krid·ə·kəl]
(nucleonics)
Capable of sustaining a chain reaction at a constant level.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

critical

Essential for continued operations. In risk analysis, one classifies data by the degree of sensitivity and criticality. See sensitive and risk assessment.
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