Look up: A1

1. 
   A1
   The accepted synonym for first-class. In Lloyd's Register, A1 is the mark of a wooden ship of the first class, A referring to the quality of her hull and '1' to the quality of her equipment.
   Found on http://www.britishempire.co.uk/glossary/
   
   
2. 
   A1
   ISO paper size 594 x 841mm
   Found on http://www.tso.co.uk/solutions/publishin
   
   
3. 
   a1
   (language) Address 1 code. An a1 code interpreter, by Matthew Newhook (matthew@engr.mun.ca) was used to test compiler output. It requires gcc 2.4.2 or higher and is portable to computers with memory segment protection. (ftp://ftp.cs.mun.ca/pub/a1). (1994-07-19)
   Found on http://foldoc.org/
   
   
4. 
   A1
   Definition (keystage 2) A standard size of paper with area 0 . 5 m 2 and sides in ratio 1 : 2 . It has dimensions 594 × 841 mm or 23 . 39 × 33 . 11 in.
   Found on http://thesaurus.maths.org/mmkb/entry.ht
   
   
5. 
   A1
   `A1` means `very good` or in the best possible condition. It is usually considered to derive from the shipping insurers, Lloyds of London's description of `A1 at Lloyd's`, a first class ship. It was also a term popularised by the British War Office ABC system of classification for recruits in the First World War. `A-1` recruits were considered fit for general service overseas. `A1` and `A-1` are often used at the start of commercial business nam...
   Found on http://en.wikipedia.org/wiki/A1