What is a dramatic speech given by a character alone on stage called?

A dramatic speech delivered by a character alone on stage is called a soliloquy. This literary device allows the audience to gain insight into the character's thoughts, feelings, and internal conflicts, providing a deeper understanding of their motivations and state of mind. It is typically used in plays to express a character’s personal reflections and can be a powerful way to convey emotions and themes to the audience without the influence of other characters.

Tone, understatement, and pun refer to different literary concepts. Tone relates to the attitude of the speaker toward a subject and can significantly affect the overall mood of a piece. Understatement is a rhetorical device that downplays a situation or emotion for effect. A pun is a form of wordplay that exploits multiple meanings of a term or similar-sounding words to create humor or a clever effect. Each of these does not fit the definition of a speech performed alone on stage, which is why they are not the correct answers.