A major creative work, especially a musical composition, or the numbered works of an artist (like Opus 5).
From Latin 'opus' meaning work or labor. It's been used in music since the Renaissance to catalog and number a composer's works chronologically.
Opus is the musical world's filing system—when you see 'Opus 9' by Beethoven, that means it was his 9th major work! It's a Latin word that's been the same for 2,000 years.
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