Definitions
1.nounA subject of a talk or an artistic piece; a topic.
2.nounA recurring idea; a motif.
3.nounAn essay written for school.
4.nounThe main melody of a piece of music, especially one that is the source of variations.
5.nounA song, or a snippet of a song, that identifies a film, a TV program, a character, etc. by playing at the appropriate time.
6.nounThe collection of color schemes, sounds, artwork etc., that "skin" an environment towards a particular motif.
7.noun(grammar) The stem of a word.
8.nounThematic relation of a noun phrase to a verb.
9.nounTheta role in generative grammar and government and binding theory.
10.nounTopic, what is generally being talked about, as opposed to rheme.
11.nounA regional unit of organisation in the Byzantine empire.
12.verbTo give a theme to."We themed the birthday party around superheroes."
13.verbTo apply a theme to; to change the visual appearance and/or layout of (software).