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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.
postoperative (post-op) pertaining to the period of time after surgery. It begins with the patient's emergence from anesthesia and continues through the time required for the acute effects of the anesthetic and surgical procedures to abate.