Definition of "PO"

Initialism of post office.  examples

(business) Initialism of purchase order.  examples

(law enforcement) Initialism of police officer.  examples

(law enforcement) Initialism of probation officer.  examples

Initialism of principal officer.  examples

Abbreviation of playoff.  examples

(pharmacology) Initialism of per os.

(medicine) Initialism of peroral.  examples