topic UK /ˈtɒpɪk/US /ˈtɑpɪk/noun 6adjective 1forms 1phrases 1 noun6 •the matter that a talk, a book or a lesson is aboutA society where a topic cannot be discussed, does not have free speech.romance is a topic that frequently comes up in conversation •(Internet) A discussion thread.If after the update you still run into bugs or odd behavior, please report them in the appropriate Steam Community thread or the relevant Discord channel/topic. — 2026 •A component similar to a message queue which supports multiple subscribers. •A musical sign intended to suggest a particular style or genre.In Peircean terms, topics are interpretants: signifieds that become new signifiers in the endless semiotic chain of interpretations. — 2012 •(no longer used) An argument or reason.contumacious persons, who are not to be fixed by any principles, whom no topics can work upon — 1675 •(no longer used) An external local application or remedy, such as a plaster, a blister, etc.Amongst topics or outward medicines none are more precious than baths. — 1624 adjective1 •topical formstopics Phrases with topic drop the topicTo stop talking about the topic at hand.