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English definition of “A3”

A3

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