, modelled after operate. Magnopere is derived from magnō opere, from magnō (the ablative masculine or neuter singular of magnus, ultimately from Proto-Indo-European *méǵh₂s) + opere (the ablative singular of opus, ultimately from Proto-Indo-European *h₃ep-).
, in this sense (1788–1824): see the 1821 quotation. Magnum opus is derived from Latin magnum opus, from magnum (the accusative neuter singular of magnus) + opus; see further at etymology 1.
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