Definition of theme

• the subject matter of a conversation or discussion; "he didnt 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 a literary or artistic work; "it was the usual `boy gets girl theme"
• (music) melodic subject of a musical composition; "the theme is announced in the first measures"; "the accompanist picked up the idea and elaborated it"