episode

noun

• an event or a group of events occurring as part of a larger sequence; an incident or period considered in isolation:the latest episode in the feud
• each of the separate installments into which a serialized story or radio or television program is divided.
• a finite period in which someone is affected by a specified illness:acute psychotic episodes
• Music a passage containing distinct material or introducing a new subject.
• a section between two choric songs in Greek tragedy.