A large theatre or stadium for spectator sports with tiers of seats for audiences. Often also called theatre or even opera house.

A broad elevated platform over the auditorium that rises above the stalls or balcony level. Also known as loge, loggia or mezzanine. The first tier above the stalls is sometimes called the Dress Circle or Grand Circle.

The upper part of a theater, or a section of the auditorium over or beside the main seating area and stage, used by the technicians that operate the lighting and sound for the show. Often there is a control booth in the back of the theatre where the technicians can see the audience.

Choosing Between Large Theatres and Stadiums: What Works Best

An arena stage is characterized by a central playing area surrounded by the audience on all sides. The floor is often raised to improve sightlines. This is the most common type of theater for concerts and is less suitable for theatrical productions than the other types of stages.

An apron is a semi-enclosed space in the wall of a theatre, usually used for technical equipment or to house statues and other decoration. Occasionally the word is also used to describe the part of the stage in front of the house tabs, or in proscenium theatres, the space in front of the arch which contains the fly tower. The apron is usually covered in cloth or netting to hide it from the audience.