noun.
A separate incident, story, or action introduced in a poem, narrative, or other writing for the purpose of giving greater variety; an incidental narrative or digression separable from the main subject, but naturally arising from it.
noun.
An incident or action standing out by itself, but more or less connected with a complete series of events: as, an episode of the war; an episode in one's life.
noun.
In music, an intermediate or digressive section of a composition, especially in a contrapuntal work, like a fugue.