noun
A subject, now especially of a talk or an artistic piece; a topic.
A recurring idea; a motif.
(dated) An essay written for school.
(music) The main melody of a piece of music, especially one that is the source of variations.
(film, television, video games) A song, or a snippet of a song, that identifies a film, a TV program, a character, etc. by playing at the appropriate time.
(crosswording) An additional puzzle within the crossword, typically involving a set of non-standard clues or answers.
(grammar) The stem of a word.
(linguistics) Thematic relation of a noun phrase to a verb.
(linguistics) Theta role in generative grammar and government and binding theory.
(linguistics) Topic, what is generally being talked about.
A regional unit of organisation in the Byzantine empire.
verb
(transitive) To give a theme to.
(computing, transitive) To apply a theme to; to change the visual appearance and/or layout of (software).