A1

• (paper size): Specified in ISO 216.

A1

1. (international standards) ISO 216 standard paper size of 594 mm × 841 mm (23.39 in × 33.11 in), with a surface area of 0.5 m² (5.38 sq ft).
2. (finance) Long-term bond credit rating by Moody's Investors Service, indicating that a bond is upper-medium grade with low risk of default.

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 (plural A1s)

1. Under the International Union of Railways (French: Union internationale des chemins de fer, 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, 1A

A1

1. (Hong Kong Cantonese) front page of a newspaper

• 頭版／头版 (tau⁴ baan²)

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

• IPA^(key): /ˈɑːeːn/

• Audio

  (file)

• Rhymes: -eːn
• Hyphenation: A‧1

A1 (uncountable)

1. A1 (a standard paper size, defined by ISO 216)

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

• “A-format” in Store norske leksikon