The standard size of typing paper adopted by the International Standards Organization. It measures 210 mm wide and 297 mm longl (about 8 1/4 x 11 3/4 inches). It is used in most countries of the world, except the US and some neighboring countries where letter-size paper (8 1/2 x 11 inch) is used. See also paper sizes.
Use A4 size paper in a sentence