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What does A1 mean?

Looking for the meaning or definition of the word A1? Here's what it means.

Noun
  1. A standard paper size, defined by ISO 216 to have dimensions: 841 x 594 mm (840.90 x 594.60 mm)
Adjective
  1. (informal) In good health.
  2. (informal) In excellent or top condition.
  3. (of a ship) First-class. (Compare A 2 and A 3, which are inferior grades.)
Proper noun
  1. Under the International Union of Railways ("UIC") classification system, a steam locomotive that has two coupled driving wheels followed by two trailing wheels, with no leading wheels; also called an 0-2-2.
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