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A4

noun [U]
 
 
/ˌeɪˈfɔːr/ US  /-ˈfɔːr/

Definition

paper that is a standard size of 21 centimetres by 29.7 centimetres: a sheet of A4 A4 paperPaper Area, mass, weight and volume in general
(Definition of A4 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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