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opus

[oh-puh s] /ˈoʊ pəs/
noun, plural opuses or especially for 1, 2, opera
[oh-per-uh, op-er-uh] /ˈoʊ pər ə, ˈɒp ər ə/ (Show IPA)
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
1695-1705; < Latin: work, labor, a work
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for opuses

opus

/ˈəʊpəs; ˈɔp-/
noun (pl) opuses, opera (ˈɒpərə)
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
op.
Word Origin
C18: from Latin: a work; compare Sanskrit apas work
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for opuses

opus

n.

"a work, composition," especially a musical one, 1809, from Latin opus "a work, labor, exertion" (source of Italian opera, French oeuvre, Spanish obra), from PIE root *op- (Germanic *ob-) "to work, produce in abundance," originally of agriculture later extended to religious acts (cf. Sanskrit apas- "work, religious act;" Avestan hvapah- "good deed;" Old High German uoben "to start work, to practice, to honor;" German üben "to exercise, practice;" Dutch oefenen, Old Norse æfa, Danish øve "to exercise, practice;" Old English æfnan "to perform, work, do," afol "power"). The plural, seldom used as such, is opera.

Online Etymology Dictionary, © 2010 Douglas Harper
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