| English noun: Po | 
| 1. | Po (substance) 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 | 
| 
 | 
 | Synonyms | atomic number 84, polonium | 
| 
 | 
 | Broader (hypernym) | metal, metallic element | 
| 
 | 
| 2. | PO (person) a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army | 
| 
 | 
 | Synonyms | P.O., petty officer | 
| 
 | 
 | Broader (hypernym) | enlisted officer, noncom, noncommissioned officer | 
| 
 | 
 | Narrower (hyponym) | master-at-arms, SCPO, senior chief petty officer | 
| 
 | 
| 3. | Po (object) a European river; flows into the Adriatic Sea | 
| 
 | 
 | Synonyms | Po River | 
| 
 | 
 | Instance hypernym | river | 
| 
 | 
 | Part meronym | Italia, Italian Republic, Italy | 
| 
 | 
| 4. | PO (group) an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States | 
| 
 | 
 | Synonyms | Post Office, United States Post Office, US Post Office | 
| 
 | 
 | Broader (hypernym) | independent agency | 
| 
 |