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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.
Outpatient (OP) Outpatient programs are for those seeking mental rehab or drug rehab, but who also stay at home every night. The main difference between outpatient treatment (OP) and intensive outpatient treatment (IOP) lies in the amount of hours the patient spends at the facility.