1) An individual camera position. A given scene will usually be covered with several different camera angles and lens sizes. Each of these is a different set-up. In American notation, each set-up for a given scene (say, scene 11) will be given a different set-up letter (11, for the master, and 11A, 11B, 11C, etc., for other angles). 2) Can also refer to the editing room table equipment -- synchronizer, rewinds, splicing block, et al.