- A4
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a standard size of paper about 8.5 inches or 210 millimetres wide and 11.5 inches or 297 millimetres longThesaurus: types and forms of paperhyponym
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n. [mass noun] a standard European size of paper, 210 × 297 mm[as modifier]
an A4 page■ paper of this sizeseveral sheets of A4
Useful english dictionary. 2012.