1. A definite, distinct occurrence; an event. 2. A usually violent or disruptive occurrence, especially one that precipitates a larger crisis. 3. An occurrence that interrupts normal procedure or functioning; a mishap. 4. A traumatic event that is recorded into memory with full emotional content, heightened perception, decisions, and postulates. Conclusions formed from these incidents are intended to aid success and survival, however, inaccurate perception often leads to wrong conclusions, less success, and lower survival ability.