A feature film, feature-length film, or theatrical film is a film (also called a motion picture or movie) with a running time long enough to be considered the principal or sole film to fill a program. The term feature film originally referred to the main, full-length film in a cinema program that also included a short film and often a newsreel. The notion of how long a feature film should be has varied according to time and place. According to the Academy of Motion Picture Arts and Sciences, the American Film Institute and the British Film Institute, a feature film runs for more than 40 minutes, while the Screen Actors Guild asserts that a feature's running time is 75 minutes or longer.