noun
the part of a theater stage in front of the curtain
adjective
relating to or characteristic of the area of a theater stage in front of the curtain
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The actors stood on the proscenium stage, ready to begin the performance.
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I love sitting in the front row near the proscenium - you get a great view of the action.
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Let's meet by the proscenium before the show starts.
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The proscenium represents the boundary between reality and the world of the play.