Definitions from Wiktionary ( )

▸ adjective:  Inclined to find fault or criticize.
▸ adjective:  Pertaining to, or indicating, a crisis or turning point.
▸ adjective:  Extremely important.
▸ adjective:  Relating to criticism or careful analysis, such as literary or film criticism.
▸ adjective:  (medicine) Of a patient condition involving unstable vital signs and a prognosis that predicts the condition could worsen; or, a patient condition that requires urgent treatment in an intensive care or critical care medical facility.
▸ adjective:  (medicine, by extension) In such a condition.
▸ adjective:  Likely to go out of control if disturbed, that is, opposite of stable.
▸ adjective:  (physics) Of the point (in temperature, reagent concentration etc.) where a nuclear or chemical reaction becomes self-sustaining.
▸ adjective:  (physics) Of a temperature that is equal to the temperature of the critical point of a substance, i.e. the temperature above which the substance cannot be liquefied.
▸ noun:  A critical value, factor, etc.
▸ noun:  In breakdancing, a kind of airflare move in which the dancer hops from one hand to the other.

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