noun an argument or reason.
2. topic ·adj topical.
3. topic ·noun an external local application or remedy, as a plaster, a blister, ·etc.
4. topic ·noun a treatise on forms of argument; a system or scheme of forms or commonplaces of argument or oratory; as, the topics of aristotle.
5. topic ·noun the subject of any distinct portion of a discourse, or argument, or literary composition; also, the general or main subject of the whole; a matter treated of; a subject, as of conversation or of thought; a matter; a point; a head.
6. topic ·noun one of the various general forms of argument employed in probable as distinguished from demonstrative reasoning, denominated by aristotle to`poi (literally, places), as being the places or sources from which arguments may be derived, or to which they may be referred; also, a prepared form of argument, applicable to a great variety of cases, with a supply of which the ancient rhetoricians and orators provided themselves; a commonplace of argument or oratory.