pro·sce·ni·um 
/proʊˈsi:nijəm/ noun
plural pro·sce·ni·ums /proʊˈsi:nijəm/ noun [count] : the part of a stage that is in front of the curtain
▪ The host walked onto the proscenium. ▪ a proscenium arch [=an arch that is over the front of a stage]
▪ The host walked onto the proscenium. ▪ a proscenium arch [=an arch that is over the front of a stage]
