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English definition of “magnum opus”

magnum opus

noun [S]     formal
the most important piece of work done by a writer or artist : Picasso's Guernica is considered by many to be his magnum opus .Foreign words and phrases used in EnglishSuccess and achievementsHigher and lower points of achievementFailures
(Definition of magnum opus noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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