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critical
1 a: relating to, indicating, or being the stage of a disease at which an abrupt change for better or worse may be anticipated with reasonable certainty <the critical phase of a fever> b: being or relating to an illness or condition involving danger of death <critical care> <a critical head injury>2 a: of sufficient size to sustain a chain reaction —used of a mass of fissionable material b: sustaining a chain reaction —used of a nuclear reactor
— crit·i·cal·ly \-k(ə-)lē\
 adverb
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