Definition of magnum opus noun from the Oxford Advanced Learner's Dictionary

 

magnum opus

 noun
noun
BrE
 
; NAmE
 
[singular](from Latin) Describing art
 
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a large and important work of art, literature or music, especially one that people think is the best work ever produced by that artist, writer, etc. The author produced his magnum opus just before he died. See related entries: Describing art Word Origin late 18th cent.: from Latin, ‘great work’.
See the Oxford Advanced American Dictionary entry: magnum opus