The document summarizes Aristotle's definition of tragedy from his work "Poetics". According to Aristotle, tragedy is an "imitation of an action that is serious, complete, and of a certain magnitude". It is presented "in the language embellished with each kind of artistic ornament" and "in the form of action, not of narrative". Most importantly, tragedy aims to produce a "catharsis" or purification of emotions like pity and fear in the audience. The document also discusses Aristotle's views on key terms like "imitation" and "action", and references other critics' commentary on Aristotle's concept of catharsis in tragedy.