Definitions
1.NounA crucial or decisive point or situation; a turning point.
2.NounAn unstable situation, in political, social, economic or military affairs, especially one involving an impending abrupt change.
3.NounA sudden change in the course of a disease, usually at which point the patient is expected to either recover or die.
4.NounA traumatic or stressful change in a person's life."I'm having a major crisis trying to wallpaper the living room."
5.NounA point in a drama at which a conflict reaches a peak before being resolved.