Long speeches by one person without interruption, often in a play or movie, or a dominating conversation where one person talks and others listen.
From French monologue, from Greek monos (alone or single) plus logos (word or speech); the word literally means 'alone-speech.'
Shakespeare's famous monologues like Hamlet's 'To be or not to be' were revolutionary because they let audiences inside a character's mind—before that, characters mostly just told each other things, but monologues are pure internal thought made external.
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