noun discourse on a certain subject.
2. theme ·noun a composition or essay required of a pupil.
3. theme ·noun the leading subject of a composition or a movement.
4. theme ·noun that by means of which a thing is done; means; instrument.
5. theme ·noun a subject or topic on which a person writes or speaks; a proposition for discussion or argument; a text.
6. theme ·noun a noun or verb, not modified by inflections; also, that part of a noun or verb which remains unchanged (except by euphonic variations) in declension or conjugation; stem.