Episode (noun)

1. A single occurrence of a recurring situation or event, especially a dramatic or exciting one.
2. A part of a television or radio program that is one installment in a series of programs.
3. A distinct period or stage in the course of a series of events, especially in someone's life or career.

Origin:

From greek episodion, meaning 'a section of a play or a story'.

Examples:

1. The bank robbery was just one episode in a long history of crime in the city.
2. I can't wait to watch the next episode of my favorite TV show.
3. This episode of the war lasted for three years.
4. The divorce was a painful episode in her life, but she learned to move on.
5. The story of their romance was told in several episodes over the course of the season.