1. A noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army
   "The PO supervised the maintenance crew";
   - petty officer, P.O.
    
2. An independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States
   - United States Post Office, US Post Office, Post Office
    
3. A commercial document used to request someone to supply something in return for payment and providing specifications and quantities
   - order, purchase order

1. A European river; flows into the Adriatic Sea
   - Po River
    
2. A radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
   - polonium, atomic number 84

Type of: commercial document, commercial instrument, enlisted officer, independent agency, metal, metallic element, noncom [informal], noncommissioned officer, river

Part of: Italia, Italian Republic, Italy

Encyclopedia: PO