monology
/məˈnɒlədʒi/ /mɒˈnɒlədʒi/noun
1A monologue.
2The habit of monologizing; the use of monologue.
Origin
Early 17th century (in an earlier sense). From mono- + -logy, perhaps after Byzantine Greek μονολογία single utterance or post-classical Latin monologion monologue, soliloquy.