Definitions for "Fourth Wall"
The imaginary fourth wall that is removed from box set to enable the audience to see the action on stage. The term now applies to the "wall" separating audience and performers on any type of stage or even film and television. Thus, the term "breaking the fourth wall" refers to an actor speaking directly to the audience.
An imaginary wall between the cast and audience which completes the area in which a piece is set.
The invisible, imagined, or implied wall through which the audience sees the performance.
A presentation that does not offer visitors an opportunity to question or interrupt interpreters' dialogue while a scene is in progress.