po Meaning, Definition & Usage

1. noun 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
   atomic number 84; polonium.
   
2. noun a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army
   petty officer; P.O..
   
3. noun a European river; flows into the Adriatic Sea
   Po River.
   
4. noun an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States
   US Post Office; Post Office; United States Post Office.
   

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