1. The part of a modern theatre stage between the curtain and the orchestra (i.e., in front of the curtain)
   "The actor delivered his monologue from the proscenium";
   - apron, forestage
    
2. The wall that separates the stage from the auditorium in a modern theatre
   "The actors waited behind the proscenium wall for their cue to enter";
   - proscenium wall

Derived forms: prosceniums, proscenia

Type of: stage, wall

Part of: theater stage [US], theatre stage

Encyclopedia: Proscenium