A4

A4 UK [ˌeɪ ˈfɔː(r)] US [ˌeɪ ˈfɔr] noun [uncountable]

a standard size of paper about 8.5 inches or 210 millimetres wide and 11.5 inches or 297 millimetres long

Thesaurus: types and forms of paper_hyponym

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n. [mass noun] a standard European size of paper, 210 × 297 mm

[as modifier] an A4 page

■ paper of this size

several sheets of A4