Definition of opus
: work entry 2 sense 3b … produced a vast opus on the history of civilization.— Norman Cousins At present he is planning the Pumpkins' next release, a double-album opus that is bound to delight the fans who snatched up his band's last release …— Chris Mundy especially : a musical composition or set of compositions usually numbered in the order of its issue the composer's first opus "… opus numbers are meant to indicate the chronological order of musical pieces, although sometimes they indicate the order of publication rather than the exact order of composition. Sometimes it's actually scholars who make chronological catalogs long after the composers have died. …" — Miles Hoffman
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