Definition of “magnum opus” - English Dictionary

british dictionary

“magnum opus” in British English

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magnum opusnoun [ S ]

uk /ˌmæɡ.nəm ˈəʊ.pəs/ us /ˌmæɡ.nəm ˈoʊ.pəs/ formal

(Definition of “magnum opus” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)