Meaning

noun a conversation between two persons

noun the lines spoken by characters in drama or fiction

noun a literary composition in the form of a conversation between two people

originInherited from Middle English dialog, from Old French dialoge (French dialogue), from Late Latin dialogus, from Ancient Greek διάλογος (diálogos, “conversation, discourse”), from διά (diá, “through, inter”) + λόγος (lógos, “speech, oration, discourse”), from διαλέγομαι (dialégomai, “to converse”), from διά (diá) + λέγειν (légein, “to speak”), equivalent to dia- (“between”) + -logue. Also…

Etymology from Wiktionary, CC BY-SA 3.0