<p><strong>Noun</strong></p><ul><li>a subject of discourse, discussion, meditation, or composition; topic.</li><li>a unifying or dominant idea, motif, etc., as in a work of art.</li><li>a short, informal essay, especially a school composition.</li><li>a principal melodic subject in a musical composition.</li><li>a short melodic subject from which variations are developed.</li><li>the element common to all or most of the forms of an inflectional paradigm.</li><li>a thing as it appears to and is constructed by the mind, as distinguished from a noumenon.</li></ul><p><strong>Adjective</strong></p><ul><li>having a unifying theme; a theme restaurant decorated like a spaceship.</li></ul><p><strong>Verb</strong></p><ul><li>to provide with a theme.</li></ul>