a speech in a play in which a character, who is alone on the stage, speaks his or her thoughts; the act of speaking thoughts in this wayHamlet’s famous soliloquy, ‘To be or not to be…’the playwright’s use of soliloquycomparemonologueWordfinderdramacomedy,denouement,dialogue,drama,dramatic irony,play,scene,set,soliloquy,speechSee related entries:Elements of a playWord OriginMiddle English: from late Latin soliloquium, from Latin solus ‘alone’ + loqui ‘speak’.
See soliloquy in the Oxford Advanced American Dictionary