Fugue (noun)

1. A piece of music in which a single main theme is repeated or imitated by voices or instruments in succession or in parallel, typically creating a complex polyphonic texture.
2. A state of temporary amnesia in which the sufferer runs away from home or otherwise disappears and is unable to remember their past life.

Origin:

Late 16th century: from french, or from latin fuga "flight", from fugere "to flee".

Examples:

1. He played a fugue on the piano.
2. The fugue was a complex piece of music with many voices and melodies.
3. She went into a fugue and couldn't remember anything about her past.
4. The fugue state was caused by traumatic events.
5. The fugue was the climax of the symphony and was very difficult to play.