Definition of proscenium noun from the Oxford Advanced American Dictionary

 

proscenium

 noun
noun
NAmE//prəˈsiniəm//
 
 
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the part of the stage in a theater that is in front of the curtain a traditional theater with a proscenium arch (= one that forms a frame for the stage where the curtain is opened)
See the Oxford Advanced Learner's Dictionary entry: proscenium