This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A creative work, especially a musical composition numbered to designate the order of a composer's works.

n. A work of music or set of works with a specified rank in an ordering of a composer's complete published works.

n. A work, especially of art.

n. A work

n. Work; a work, as a literary or musical composition (in the latter use often abbreviated op.).

n. a musical work that has been created

"The book, generally considered to be his magnum opus, is largely credited with creating the terminology and shape of modern macroeconomics."

music   

opus saracenicum    opus signinum    opus alexandrinum    opus araneum    opus filatorium    opus sectile    opus plumarium    opus insertum    opus punctatum    opus spicatum   

symphonic poem    allegretto    octette    duette    allegro    study    adagio    potpourri    motet    musical arrangement   

work   

mopus   

drama    comedy    opera    theatre    concert    novel    poem    play    poetry    ballad