A prologue is the whole of that part of a tragedy which precedes the entrance of the chorus.

An episode is the whole of that part of a tragedy which falls between whole choral songs.

An exode is the whole of that part of a tragedy which is not followed by a song of the chorus.

A parode is the whole of the first utterance of the chorus.

A stasimon is a choral song without anapaests or trochaics.This does not apply to surviving Greek tragedies, but may be true of those of Aristotle’s time. The word Stasimon is applied to all choruses in a tragedy other than those sung during entry or exit. It is usually explained as meaning a stationary song, because it was sung after the chorus had taken up its station in the orchestra.