Liddell-Scott-Jones

κάθαρσις (katharsis) a cleansing ^G:N-F

κάθαρσις-σις, εως, ἡ,

Elean κόθαρσις [Refs], cleansing from guilt or defilement, purification, [Refs 5th c.BC+]; cleansing of the universe by fire, Zeno and [Refs 3rd c.BC+]; cleansing of food by or before cooking, [Refs]

__2 clarification, φυσικῶν προβλημάτων [Refs 4th c.BC+]; καθάρσεως δεῖται needs explanation, [Refs 1st c.BC+]
__II in Medicine texts, clearing off of morbid humours, etc., evacuation, whether natural or by the use of medicines [Refs 5th c.BC+]; ἰατρικὴ κ. [Refs 5th c.BC+]; καθάρσεις, the menses in women, [Refs 5th c.BC+]; so κάθαρσις alone, [Refs 5th c.BC+]
__II.b τραγῳδία.. δι᾽ ἐλέου καὶ φόβου περαίνουσα τὴν τῶν τοιούτων παθημάτων κ. [Refs 4th c.BC+]
__III pruning of trees, [Refs 4th c.BC+]
__IV winnowing of grain, in plural, [Refs 2nd c.BC+]; κ. πυροῦ [Refs 1st c.BC+]; τοῦ καρποῦ [Refs 1st c.AD+]
__V clearing of land, [Refs 3rd c.BC+]