Catharsis (Ancient Greek: Κάθαρσις) is a Greek word meaning "purification", "cleansing" or "clarification." It is derived from the infinitive verb of Ancient Greek: καθαίρειν transliterated as kathairein "to purify, purge," and adjective Ancient Greek: καθαρός katharos "pure or clean." The term in drama refers to a sudden emotional climax that evokes overwhelming feelings of great sorrow, pity, laughter or any other extreme change in emotion, resulting in restoration, renewal and revitalization in members of the audience.[citation needed] Using the term "catharsis" to refer to a form of emotional cleansing was first done by the Greek philosopher Aristotle in his work Poetics. It refers to the sensation, or literary effect, that would ideally overcome an audience upon finishing watching a tragedy (a release of pent-up emotion or energy). In his previous works, he used the term in its medical sense (usually referring to the evacuation of the "katamenia", the menstrual fluid or other reproductive material).
Because of this, F. L. Lucas maintains that catharsis cannot be properly translated as purification or cleansing, but only as purgation. Since before Poetics catharsis was purely a medical term, Aristotle is employing it as a medical metaphor.
"It is the human soul that is purged of its excessive passions." Lessing sidesteps the medical aspect of the issue and translates catharsis as a purification, an experience that brings pity and fear into their proper balance: "In real life, he explained, men are sometimes too much addicted to pity or fear, sometimes too little; tragedy brings them back to a virtuous and happy mean." Tragedy is then a corrective; through watching tragedy the audience learns how to feel these emotions at the proper levels. Some modern interpreters of the work infer that catharsis is pleasurable because audience members felt ekstasis (Greek: ἔκστασις)(ecstacy)(literally: astonishment, meaning: trance) from the fact that there existed those who could suffer a worse fate than them was to them a relief.[citation needed] Any translator attempting to interpret Aristotle's meaning of the term should take into account that Poetics is largely a response to Plato's claim that poetry encourages men to be hysterical and uncontrolled. In response to Plato, Aristotle maintains that poetry makes them less, not more, emotional, by giving a periodic and healthy outlet to their feelings.