noun

1. a long speech by one speaker, esp. one monopolizing the conversation
2. a passage or composition, in verse or prose, presenting the words or thoughts of a single character
3. a part of a play in which one character speaks alone; soliloquy
4. a play, skit, or recitation for one actor only

Etymology: Fr < Gr monologos, speaking alone < monos, single (see mono-) + legein, to speak (see logic)