opus

[oh-puhs]
noun, plural opuses or especially for 1, 2, opera [oh-per-uh, op-er-uh] .
1.
a musical composition.
2.
one of the compositions of a composer, usually numbered according to the order of publication.
3.
a literary work or composition, as a book: Have you read her latest opus? Abbreviation: op.

Origin:
1695–1705; < Latin: work, labor, a work

Dictionary.com Unabridged

finis coronat opus

[fee-nis-koh-roh-naht-oh-poos; English fin-is kaw-roh-nat oh-puhs, koh-]
Latin.
the end crowns the work.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
opus (ˈəʊpəs, ˈɔp-)
 
n , pl opuses, opera
1.  an artistic composition, esp a musical work
2.  (often capital) (usually followed by a number) a musical composition by a particular composer, generally catalogued in order of publication: Beethoven's opus 61 is his violin concerto
 
[C18: from Latin: a work; compare Sanskrit apas work]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

opus
1809, "a work, composition," esp. a musical one," from L. opus "a work, labor, exertion" (cf. It. opera, Fr. oeuvre, Sp. obra), from PIE base *op- (Gmc. *ob-) "to work, produce in abundance," originally of agriculture later extended to religious acts (cf. Skt. apas- "work, religious act;" Avestan hvapah-
"good deed;" O.H.G. uoben "to start work, to practice, to honor;" Ger. üben "to exercise, practice;" Du. oefenen, O.N. æfa, Dan. øve "to exercise, practice;" O.E. æfnan "to perform, work, do," afol "power"). The plural, seldom used, is opera.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

Opus definition

project, product
A Honeywell operating system promised as a sop to customers after canning Multics in 1985. Opus was to provide everything Multics had and more, plus total compatibility with the Level 6/DPS6 operating system.
"Opus" was a code name, the system was officially named VS3 (short for HVS R3 or Honeywell Virtual System Release Three). It was to run on the DPS6-plus hardware known internally as the MRX and HRX, and be all things to all people.
The hardware was a dud (though it did run the native DPS6 software just fine), and the goal was, shall we say, ambitious. The effort was cancelled by Bull in 1987, in favor of another project going on in France.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
His next opus-to be published later this year-explores medicine and pathology.
She did not care for opus, who she originally thought to be a large rodent.
You'd think that the omnipotent creator would have mentioned such a thing in
  its magnum opus.
He had the credentials before he wrote his magnum opus.
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