Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “A3”


noun [U] uk   /ˌeɪˈθriː/ us  
paper that is a standard size of 29.7 centimetres by 42 centimetres: a sheet of A3 A3 paperPaper Area, mass, weight and volume in general
(Definition of A3 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of A3?
Add Cambridge dictionaries to your browser to your website

Definitions of “A3” in other dictionaries

Word of the Day


to throw or drop something carelessly

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