PO

UK: /ˌpiːˈəʊ/ US: 'PO': (pē′ō′); 'po', 'Po': (pō)

Collins Concise English Dictionary © HarperCollins Publishers::

PO abbreviation

1. Post Office
2. Personnel Officer
3. petty officer
4. Pilot Officer
5. Also: p.o. postal order

WordReference Random House Learner's Dictionary of American English © 2026

P.O.,  an abbreviation of:

1. postal (money) order.
2. post office.

WordReference Random House Unabridged Dictionary of American English © 2026

po  (pō), n., pl. pos. [Australia and New Zealand.]

1. British Terms a chamber pot.

• French pot (de chambre) chamber pot
• probably 1875–80

Po  (pō), n. 

1. Chemistry, Place Names a river in Italy, flowing E from the Alps in the NW to the Adriatic. 418 mi. (669 km) long. Ancient, Padus. 

Po, [Symbol, Chem.]

1. polonium.

po., [Baseball.]

1. Sport put-out;
   put-outs.

P.O., 

1. parole officer.
2. petty officer.
3. postal (money) order.
4. Stamps post office.

p.o., 

1. Drugs (in prescriptions) by mouth.

• Latin per ōs

Collins Concise English Dictionary © HarperCollins Publishers::

Po symbol:chemical

1. polonium

Po / pəʊ/ noun

1. a river in N Italy, rising in the Cottian Alps and flowing northeast to Turin, then east to the Adriatic: the longest river in Italy. Length: 652 km (405 miles)
   Latin name: Padus

Collins Concise English Dictionary © HarperCollins Publishers::

po / pəʊ/ noun (pos)

1. 
   an informal word for chamberpot

Etymology: 19th Century: from pot¹