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English definition of “A4”

A4

noun [U] uk   /ˌeɪˈfɔːr/ us    /-ˈfɔːr/
paper that is a standard size of 21 centimetres by 29.7 centimetres: a sheet of A4 A4 paper
(Definition of A4 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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