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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.
The rating OP-GP is given to osteopathic physicians in general practice. The OP designation, when combined with one of the specialty ratings, indicates that the specialist is an osteopathic physician (e.g.,OPOS, is the proper rating for an osteopathic physician who is a qualified specialist in Orthopedic Surgery.