noun, plural pro·sce·ni·a [proh-see-nee-uh, pruh-] /proʊˈsi ni ə, prə-/. Theater.
Examples from the Web for proscenium
The chief feat however is not yet performed, that which is to be acted in front of the Proscenium!Beethoven's Letters 1790-1826 Vol. 2|Lady Wallace
The Proscenium Arch is the arch or frame extending around the front of the stage of a theatre.The Boy Craftsman|A. Neely Hall
Anyway, I'm going to propose, him for the Stuyvesant and the Proscenium.The Younger Set|Robert W. Chambers
British Dictionary definitions for proscenium
noun plural -nia (-nɪə) or -niums
Word Origin for proscenium
Word Origin and History for proscenium
c.1600, "stage of an ancient theater," from Latin proscaenium, from Greek proskenion "the space in front of the scenery," also "entrance of a tent," from pro "in front" (see pro-) + skene "stage, tent, booth" (see scene). Modern sense of "space between the curtain and the orchestra" is attested from 1807.