AS

1. A. S. (automobile)
2. A.S. Roma
3. Abilene and Southern Railway
4. ActionScript
5. Addressed to the Subject
6. Adult Swim
7. Æsir 
8. Aggregate supply
9. Akademiska Sångföreningen 
10. Akciová společnost 
11. Akershus county
12. Aksjeselskap
13. Aktieselskab
14.  Alaska Airlines
15. Almost surely 
16. Almost surely 
17. American Samoa
18. Anabolic Steroids
19. Angelman syndrome
20. Ankylosing spondylitis
21. Annunciation Style (A.S.)
22. Anti-submarine warfare
23. Aortic stenosis
24. Arcsecond, ¹⁄₆₀ arcminute
25. Armée secrète
26. Armée secrète (Belgium
27. Arsenic 
28. Aš (cuneiform) 
29. As (Roman coin)
30. as (Unix)
31. AS Level
32. AS Standards Australia
33. As, Belgium
34. Ås, Sør-Trøndelag
35. As-e Jadid
36. As-e Qadim 
37. Asparagine synthase (glutamine-hydrolysing)
38. Asperger syndrome
39. Assamese language
40. Associate of Science
41. Attosecond 
42. Attosiemens 
43. Australia
44. Australian Standards
45. Authentication server
46. Autism spectrum
47. Autonomous system (Internet)