monologuist

noun

1. a form of dramatic entertainment, comedic solo, or the like by a single speaker: a comedian’s monologue.
2. a prolonged talk or discourse by a single speaker, especially one dominating or monopolizing a conversation.
3. any composition, as a poem, in which a single person speaks alone.
4. a part of a drama in which a single actor speaks alone; soliloquy.

noun

1. a long speech made by one actor in a play, film, etc, esp when alone
2. a dramatic piece for a single performer
3. any long speech by one person, esp when interfering with conversation

n.1660s, “long speech by one person,” from French monologue, from Late Greek monologos “speaking alone,” from Greek monos “single, alone” (see mono-) + logos “speech, word,” from legein “to speak” (see lecture (n.)).