A separate incident, story, or action, introduced for the purpose of giving a greater variety to the events related; an incidental narrative, or digression, separable from the main subject, but naturally arising from it.

An air pollution incident in a given area caused by a concentration of atmospheric pollutants under meteorological conditions that may result in a significant increase in illnesses or deaths. May also describe water pollution events or hazardous material spills.

In asthma, a period of markedly worsened symptoms. This may be brought on by exposure to a known trigger or by an upper respiratory infection (a cold), or it may not have a known explanation. An episode may come on all of a sudden or may develop gradually over days. Asthma episodes, at their worst, can be life-threatening, and should always be taken seriously. See exacerbation.

A portion of a narrative within a television or radio series that relates an event or a series of connected events and forms a coherent story in itself.

An instalment in a dramatic series, or the teleplay of that instalment.

a series of two or more turns

a brief section of a literary or dramatic work that forms part of a connected series

a part of a broadcast serial

a specific period of mania or depression.

a well-defined period of a week or more

In bipolar disorder, a period of either mania or depression that may last for hours, days, weeks, or even months.

An occurrence of either mania or depression. A mood episode may last for hours, days, weeks, or even months.

A subsidiary passage other than the main thematic material. Episodes come, for example, between statements of a fugue, or between recurrences of the rondo theme in a rondo; but almost any self-contained section can be thought episodic.

(1) In a fugue, a freer passage between full statements of the subject; (2) in ritornello form, a freer concertina passage between ripieno statements of the ritornello.

a portion of the fugue where the subject does not appear as a melodic whole

Interlude or intermediate section in the Baroque fugue, which serves as an area of relaxation between statements of the subject.