1. Noun.  A standard paper size, defined by ISO 216 as having dimensions 74 x 53 mm (74.325 x 52.556 mm).
  2. Noun.  (''as a modifier'') Describing paper of that size.
  3. Proper noun.  The eight former Eastern European countries that acceded to the European Union in 2004.

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This entry was last updated on RefTopia from its source on 3/20/2012.