Webster’s Revised Unabridged Dictionary · 1913
Crisis
Cri′sis (kr?′s?s), n.; pl. Crises (-sēz). [L. crisis, Gr. κρίσις, fr. κρίνειν to separate. See Certain.] 1. The point of time when it is to be decided whether any affair or course of action must go on, or be modified or terminate; the decisive moment; the turning point.
This hour's the very crisis of your fate. Dryden.
The very times of crisis for the fate of the country. Brougham.
2. (Med.) That change in a disease which indicates whether the result is to be recovery or death; sometimes, also, a striking change of symptoms attended by an outward manifestation, as by an eruption or sweat.
Till some safe crisis authorize their skill. Dryden.