Magnum Opus Definition

magnəm ōpəs
noun
A great work, esp. of art or literature; masterpiece.
Webster's New World
A person's greatest work or undertaking.
Webster's New World

The best, most popular, or most renowned achievement of an author or artist, representing his major life effort.

Wiktionary

Other Word Forms of Magnum Opus

Noun

Singular:
magnum opus
Plural:
magna-opera, magnum-opuses

Origin of Magnum Opus

  • Latin magnum neuter of magnus great opus work

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin magnum opus (“great work").

    From Wiktionary

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magnum opus