Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “post office box number”

post office box number

a number on a box in a post office to which your mail is delivered for you to collect
(Definition of post office box number noun from the Cambridge Business English Dictionary © Cambridge University Press)
Focus on the pronunciation of post office box number

Word of the Day


to pour liquid slowly over something, especially in a thin line or in small drops

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