Theatre Terms

image of question markHere you'll find over 1000 definitions of theatrical terms, from Aside, Beam Angle, and Camlock, to Upstaging, VU Meter, and Wagon.  Fully searchable, our glossary is helpful for technical staff, directors, actors, producers, or anyone wanting to better understand the inner workings of theatre.

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Term Definition Cross Reference Link
IRIS Adjustable aperture which, when placed in the gate of a profile instrument, varies the size of a beam of light. Originally, iris diaphragm.
IRISING Using the adjustable aperture on a lighting instrument to reduce the size of the light beam hitting the stage. If the aperture permits it, the size of the beam can be made quite small (referred to as "the button", or closed altogether.
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