Because theater terms are specific to their own world a separate glossary is required. Some of the words do cross over with other types of shows but some are specific and have different meanings in theater.
Advance bar: Lighting bar hung from the auditorium ceiling as opposed to over the stage to provide lighting from the front
Ambient light: General indirect light from reflections or non-specific light sources
Anchor: Fixing to stage floor, e.g. scenery
Animation disc: Rotated in front of a light to create moving effects such as clouds. May be called an ‘animated gobo’
Apron: Part of the stage projecting into the main auditorium in front of the curtain
Areas: Places that are defined lighting-wise. As an example there may be ...