1. the part of a theater stage in front of the curtain
Usage: theater
2. the arch or opening that frames the stage in a theater
Usage: theater; architecture

Examples

• The actor stepped forward onto the proscenium to deliver his monologue.
• The ornate proscenium arch was decorated with gold leaf and carved angels.
• Modern theaters often eliminate the traditional proscenium design.
• The proscenium creates a clear boundary between the audience and the performance.
• Behind the proscenium, stagehands prepared the next scene change.
• The theater’s proscenium was built in the classical style of the 1920s.