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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.
What does the medical abbreviation PO mean? PO means taking a pill or liquid by mouth.    By Mouth = Per Oral in Latin    Another medical meaning could be post operative (after an  operation) which is alsâ¦o originally latin: post operationem.