S

selective focusing: on-screen focus change from object in foreground to object in background or vice versa. See also rackfocusing
slow motion: an action scene filmed at a rate faster than the standard projection rate of 24 fps and then projected at the standard rate, thereby creating the effect of slower than normal motion.
star: an extremely popular film actor. See also personality star and persona
storyline: a detailed description of the plot or a motion picture, TV series, etc. for use by writers, producers, or prospective investors
surrealism: expressing the activities of the subconscious mind through fantastic imagery
sync: abbreviation for synchronization and usually refers the relationship between the sound and the picture
sync track: a sound track recorded in sync with a camera recording