Etymology
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proscenium (n.)

c. 1600, "stage of an ancient theater," from Latin proscaenium, from Greek proskēnion "the space in front of the scenery," also "entrance of a tent," from pro "in front, before" (see pro-) + skēnē "stage, tent, booth" (see scene). Modern sense of "space between the curtain and the orchestra" (often including the curtain and its framework) is attested from 1807. Hence, figuratively, "foreground, front" (1640s).

updated on December 16, 2020

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Definitions of proscenium from WordNet

proscenium (n.)
the part of a modern theater stage between the curtain and the orchestra (i.e., in front of the curtain);
Synonyms: apron / forestage
proscenium (n.)
the wall that separates the stage from the auditorium in a modern theater;
Synonyms: proscenium wall
From wordnet.princeton.edu, not affiliated with etymonline.