Definition of: fugue

(fyg) noun Music
1. A form, or sometimes a complete composition in strict poly-phonic style in which a theme is introduced by one part, harmonized by contrapuntal rule, and reintroduced throughout.
2. Psychiatry An interval of flight from reality, during which an individual will assume a personality and perform actions in themselves rational but entirely forgotten upon the return of normal consciousness: a form of amnesia. [<F <Ital. fuga <L, a flight]
—fug′al adjective