A1

See the Wikipedia article ISO 216, the international standard on paper sizes.

A1

1. A standard paper size, defined by ISO 216 to have dimensions: 841 x 594 mm (840.90 x 594.60 mm)

   a sheet of A1 paper

• (A paper sizes): 2A0   A0   A1   A2   A3   A4   A5   A6   A7   A8   A9   A10

From various rating systems, as that of Lloyd's of London or the condition of insured ships. First attested in 1837.

• A-1, A 1

A1 (not comparable)

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.)

A1

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.

• 1-A