magnum opus

IPA/ˌmæɡnəm ˈəʊpəs/
IPA/ˌmæɡnəm ˈəʊpəs/

magnum opus — noun

1. The single most significant creation in the lifetime of a painter, writer, compo

1.nounB2
Definition

The single most significant creation in the lifetime of a painter, writer, composer, or other artist.

Example

Diego's fifth novel won several awards and is now considered his magnum opus.

possessive + magnum opus with 'consider' passive

The gallery exhibition features Femi's magnum opus — a painting forty years in the making.

magnum opus introduced with a long creative period

Common collocations
  • publish one's magnum opus
  • complete one's magnum opus
  • consider something one's magnum opus
  • literary magnum opus
  • artistic magnum opus
  • musical magnum opus
Synonyms
  • masterpiece

    more common in everyday speech; can refer to any excellent work, not necessarily the greatest one

  • masterwork

    slightly more formal than masterpiece; often used for handcrafted or visual arts

  • chef-d'œuvre

    French loanword with the same meaning; very formal and literary

Grammar Patterns

possessive + magnum opus

the magnum opus of + [person]

Usage Note

Frequently used with a possessive determiner (his, her, their) or in the structure 'the magnum opus of [name]'. The plural form magna opera is rare; most speakers use magnum opuses in English.

Common Mistakes

The Mona Lisa is a magnum opus painting.
The Mona Lisa is considered Leonardo's magnum opus.
magnum opus is a noun, not an adjective; it refers to the work itself, not a category of works.
She wrote several magnum opuses this year.
She spent twenty years writing her magnum opus.
the term implies a once-in-a-lifetime achievement, not something produced regularly.

2. The greatest project or achievement someone has completed, in any line of work o

2.nounC1
Definition

The greatest project or achievement someone has completed, in any line of work or creative effort.

Example

Imran's magnum opus was the solar-powered water system he built for the village.

magnum opus used for engineering achievement

Professor Heather finally published her magnum opus on marine ecosystems after decades of study.

Common collocations
  • career magnum opus
  • architectural magnum opus
  • scientific magnum opus
  • build one's magnum opus
  • regard something as one's magnum opus
Synonyms
  • crowning achievement

    highlights that this is the peak moment of a career; slightly more dramatic in tone

  • greatest work

    more straightforward and less formal; works in any context

Grammar Patterns

possessive + magnum opus

regard something as + possessive + magnum opus

Usage Note

Distinguish from sense 1: this sense extends beyond the arts to any profession — science, engineering, business, or public service. The subject is often an institution or person whose career is defined by a single outstanding contribution.

Common Mistakes

My homework was my magnum opus.
Her doctoral dissertation became her magnum opus.
magnum opus implies a work of lasting significance, not a routine task.

Word family

  • opus
    nounB2
  • magnum opuses
    nounC1
  • opera omnia
    nounC2

Synonym discussion

Sense: noun/1

Magnum opus, masterpiece, masterwork, and crowning achievement all refer to outstanding creative work, but they differ in scope. Masterpiece is the most general term — any excellent work in any medium can be called a masterpiece, and a single artist may produce several. Masterwork is slightly more formal and often implies craftsmanship (e.g., a woodcarver's masterwork). Crowning achievement explicitly positions the work as the pinnacle of a career, just as magnum opus does, but crowning achievement can be used outside the arts — an engineer's crowning achievement might be a bridge, but calling it their magnum opus carries a more literary tone. Magnum opus specifically suggests a monumental, life-defining work that required many years to complete. A painter might complete dozens of masterpieces, but only one magnum opus — the work that defines their entire legacy.

masterpiece ↗masterwork ↗crowning achievement

Common collocations

Nouns

Adverbs

  • widely regarded as
  • universally considered
  • generally viewed as
  • often called

Phrases

  • consider something one's magnum opus
  • regard something as one's magnum opus
  • the magnum opus of someone

Prepositions

  • of (the magnum opus of Picasso)
  • as (regarded as one's magnum opus)

Etymology

LatinEnglish

Directly borrowed from Latin, where magnus means 'great' and opus means 'work'. The phrase entered English in the late 18th century as a learned borrowing used by art critics and literary scholars, then gradually spread into general usage to describe any person's crowning achievement.

First known use

1791

1791, in the meaning defined above