1. a creative work, especially a musical composition
2. a major work or achievement by an artist, writer, or composer

Examples

• Beethoven’s Opus 27 includes the famous Moonlight Sonata.
• The symphony was the composer’s final opus before retirement.
• Her latest novel is considered her greatest opus.
• The artist spent five years creating this opus.
• Mozart’s Opus 40 is frequently performed by orchestras.
• The cathedral stands as the architect’s crowning opus.