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English Dictionary

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 A4 A4 /ˈeɪˈfɔr/

noun

  1. A common standard paper size (21.0 x 29.7 cm); half the area of A3, twice area of A5  ( A4 )
    a common standard paper size (21.0 x 29.7 cm); half the area of A3, twice area of A5