Theme

A subject or topic on which a person writes or speaks; a proposition for discussion or argument; a text.

Discourse on a certain subject.

A composition or essay required of a pupil.

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.

That by means of which a thing is done; means; instrument.

The leading subject of a composition or a movement.

the subject matter of a conversation or discussion; "he didn't want to discuss that subject"; "it was a very sensitive topic"; "his letters were always on the theme of love"

a unifying idea that is a recurrent element in literary or artistic work; "it was the usual ‘boy gets girl’ theme"

(linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem"

(music) melodic subject of a musical composition; "the theme is announced in the first measures"; "the accompanist picked up the idea and elaborated it"