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English definition of “A4”

A4

noun [U]     /ˌeɪˈfɔːr/ US  /-ˈfɔːr/
paper that is a standard size of 21 centimetres by 29.7 centimetres : a sheet of A4 A4 paper Paper 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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