theme

an idea that a talk, a book, a film or a piece of art is mainly about

Topic, what is generally being talked about.

A recurring idea; a motif.

A concept with multiple instantiations.

Any of various colors, or color palettes, in which a design is offered; (graphical user interface) any of various skins for an app, affecting the visuals and perhaps other elements such as sound effects.

A song, or a snippet of a song, that identifies a film, a TV program, a character, etc. by playing at the appropriate time.

The main melody of a piece of music, especially one that is the source of variations.

(old-fashioned) An essay written for school.

An additional puzzle within the crossword, typically involving a set of non-standard clues or answers.

Thematic relation of a noun phrase to a verb.

Theta role in generative grammar and government and binding theory.

The stem of a word.

A regional unit of organisation in the Byzantine empire.

To give a theme to.

To apply a theme to; to change the visual appearance and/or layout of (software).