Separation may refer to: Separation (United States military), the process by which a service member leaves active duty Separation (Air Traffic Control), rules to minimise the risk of collision between aircraft in flight Separation (1967 film), a British feature film written by and starring Jane Arden and directed by Jack Bond Separation mastering, in music recording In science: Flow separation, separation of a fluid boundary layer from the surface of a solid body moving relative to the flui… (More on Separation)