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English definition of “A3”

A3

noun [U] uk   /ˌeɪˈθriː/ us  
paper that is a standard size of 29.7 centimetres by 42 centimetres: a sheet of A3 A3 paperPaper Area, mass, weight and volume in general
(Definition of A3 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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