episode

noun

• 1an event or a group of events occurring as part of a sequence; an incident or period considered in isolation:the whole episode has been a major embarrassment
• a finite period in which someone is affected by a specified illness:acute psychotic episodes

• 2each of the separate instalments into which a serialized story or radio or television programme is divided: the final episode of the series
• Music a passage containing distinct material or introducing a new subject: this change is followed by an episode in this new key
• a section between two choric songs in Greek tragedy.