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.
5.nounA point in a drama at which a conflict reaches a peak before being resolved.