A3 Definition in the Cambridge English Dictionary
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Definition of “A3” - English Dictionary

Definition of "A3" - British English Dictionary

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A3noun [U]

uk   us   /ˌeɪˈθriː/
in the UK, ​paper that is a ​standardsize of 29.7 ​centimetres by 42 ​centimetres: a ​sheet of A3 A3 ​paper
(Definition of A3 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "A3" - Business English Dictionary

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A3noun [U]

uk   us  
MEASURES, WORKPLACE a ​standardinternationalpapersize, ​measuring 297mm × 420mm
(Definition of A3 from the Cambridge Business English Dictionary © Cambridge University Press)
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