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op. cit.

[op sit]
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  1. in the work cited.

Origin of op. cit.

From the Latin word opere citātō
Can be confusedibid. ibidem idem op. cit.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for op. cit.

op. cit.

abbreviation for (in textual annotations)
  1. opere citato

Word Origin

Latin: in the work cited
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

Word Origin and History for op. cit.

abbreviation of Latin opus citatum, literally "the work quoted."

Online Etymology Dictionary, © 2010 Douglas Harper