Definition of "proscenium" [pro•sce•ni•um]

• The area of a modern theater that is located between the curtain and the orchestra. (noun)
• The stage of an ancient theater, located between the background and the orchestra. (noun)
• A proscenium arch. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "But the grand subject of their admiration was what is rather affectedly called "The Heptaplasiesoptron," or fancy reflective proscenium, which is placed in the long room fronting the orchestra of the Rotunda."
• "A proscenium is a piece of custom home theater furniture designed to hold a projection screen, built in speakers and controls, and custom cabinetry that will store DVDs, movies, music, and other home theater items."
• "A kind of proscenium, which could be taken down and shut up in a closet, formed the whole theatre."