This is the definition at the centre of the Poetics, the earliest surviving treatise on drama in the West. Aristotle names what tragedy imitates, how it is spoken and what it does to its audience, and then ranks the plot above the other elements. It sits under this term as the account against which later writers measure what tragedy is for.
Read in contextTragedy, then, is an imitation of an action that is serious, complete, and of a certain magnitude; in language embellished with each kind of artistic ornament, the several kinds being found in separate parts of the play; in the form of action, not of narrative; through pity and fear effecting the proper purgation of these emotions. By ‘language embellished,’ I mean language into which rhythm, ‘harmony,’ and song enter. By ‘the several kinds in separate parts,’ I mean, that some parts are rendered through the medium of verse alone, others again with the aid of song. … The Plot, then, is the first principle, and, as it were, the soul of a tragedy: Character holds the second place. A similar fact is seen in painting. The most beautiful colours, laid on confusedly, will not give as much pleasure as the chalk outline of a portrait. Thus Tragedy is the imitation of an action, and of the agents mainly with a view to the action.
