Definitions
1.nounA release of emotional tension after an overwhelming vicarious experience, resulting in the purging or purification of the emotions, as through watching a dramatic production (especially a tragedy).
2.nounAny release of emotional tension to the same effect, more widely.
3.nounA purification or cleansing, especially emotional.
4.nounA therapeutic technique to relieve tension by re-establishing the association of an emotion with the memory or idea of the event that first caused it, and then eliminating it by complete expression (called the abreaction).
5.nounPurging of the digestive system.