A situation where an actor addresses the audience without the other actors hearing him is called
Answer Details
The term you're looking for is "Aside." An aside is a dramatic device in which an actor speaks to the audience without the other characters on stage being aware of what is being said. This allows the actor to share their thoughts, feelings, or motivations with the audience in a way that is separate from the main action of the play. An aside is like a secret conversation between the actor and the audience, and it can be used to add depth and complexity to a character or to comment on the events of the play.