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Definition of op. 1  1 chiefly US : a set of planned actions for a particular purpose âusually plural military ops [=operations] 2  2 : op art. 3  3 British, informal : a medical operation â see also photo op.
OP [Internet]; Aug 15, 2016 [cited 2016 Aug 15]. Available from: http://www.allacronyms.com/_Medical/OP. 'OP', All Acronyms, 15 August 2016, <http://www.allacronyms.com/_Medical/OP> [accessed 15 August 2016] All Acronyms, OP (Aug. 15, 2016, 9:08 AM), available at http://www.allacronyms.com/_Medical/OP.