Definition of monologue noun from the Oxford Advanced American Dictionary

monologue

noun (also monolog)
/ˈmɑnəˌlɔɡ; ˈmɑnəˌlɑɡ/
 
 
1 [countable] a long speech by one person during a conversation that stops other people from speaking or expressing an opinionHe went into a long monologue about life in Texas.2 [uncountable, countable] a long speech in a play, movie, etc. spoken by one actor, especially when alone3 [countable, uncountable] a dramatic story, especially in verse, told or performed by one persona dramatic monologue compare dialogue, soliloquy