A sizes

A series


noun

a series of paper sizes approved by the International Standards Organization, running from 2AO to A7, each size (defined in mm) being half as large as the one preceding it, as follows: 2AO,1189 × 1682; AO, 841 × 1189; A1, 594 × 841; A2, 420 × 594; A3, 297 × 420; A4, 210 × 297; A5, 148 × 210; A6, 105 × 148; A7, 74 × 105

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What does “blatherskite” mean?
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012