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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). Etymology: AS, ut + L, patientia, endurance. 1 n, a patient, not hospitalized, who is being treated in an office, clinic, or other ambulatory care facility. 2 adj, pertaining to a health care facility for patients who are not hospitalized or to the treatment or care of such a patient.Compare inpatient.Managed care. adjective Referring to that which occurs outside of an institutional health care environment or hospital settingâe.g., therapy.utpatient. adjective Referring to that which occursâeg, therapy, outside of an institutional health care environment or hospital setting noun A Pt undergoing a diagnostic workup, evaluation, or treatment outside of a hospital.