A4 Meaning in the Cambridge English Dictionary
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Meaning of “A4” in the English Dictionary

"A4" in British English

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A4noun [U]

uk   /ˌeɪˈfɔːr/  us   /-ˈfɔːr/
in the UK, ​paper that is a ​standardsize of 21 ​centimetres by 29.7 ​centimetres: a ​sheet of A4 A4 ​paper
(Definition of A4 from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"A4" in Business English

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A4noun [U]

uk   us  
MEASURES, WORKPLACE a ​standardinternationalpapersize, ​measuring 210mm × 297mm: It's not a ​longreport – just a couple of ​sides of A4.
(Definition of A4 from the Cambridge Business English Dictionary © Cambridge University Press)
Translations of “A4”
in Chinese (Simplified) A4 纸(的)…
in Chinese (Traditional) A4 紙(的)…
What is the pronunciation of A4?