Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “post office box”

post office box

noun [C]  /ˈpoʊst ˌɔ·fɪs ˌbɑks, ˌɑf·ɪs/ (abbreviation P.O. Box) us  
a small, numbered, locked box at a post office to which letters are delivered
(Definition of post office box from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of post office box?
Add Cambridge dictionaries to your browser to your website

Definitions of “post office box” in other dictionaries

Word of the Day


a measure for liquid equal to about half a litre

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More