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Search also in: Web News Encyclopedia Images. opus (opuses plural) (opera plural) 1 n-count An opus is a piece of classical music by a particular composer. Opus is usually followed by a number which indicates at what point the piece was written. The abbreviation op. is also used.
exÂ·poÂ·siÂ·tion. n. 1. A setting forth of meaning or intent. 2. a. A statement or rhetorical discourse intended to give information about or an explanation of difficult material. b. The art or technique of composing such discourses. 3. Music. a. The first part of a composition in sonata form that introduces the themes. b. The opening section of a fugue. 4. The part of a play that provides the background information needed to understand the characters and the action.