Crisis ¹

Definition: 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.

Crisis ²

Definition: 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.

crisis ³

Definition: a crucial stage or turning point in the course of something; "after the crisis the patient either dies or gets better"

crisis ⁴

Definition: an unstable situation of extreme danger or difficulty; "they went bankrupt during the economic crisis"