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Noun
A4
- A standard paper size, defined by the international standard ISO 216 as 210 x 297 mm. Often used attributively.
- This printer can handle Letter, Legal and A4.
- Hand me a sheet of A4 paper, please.
See also
Proper noun
A4
- A major thoroughfare in England
- There is a long tailback on the A4, due to an accident.