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1. The highest level of minor league baseball, often used by extension in other sports to indicate the highest level of minor league play in that sport as well.
2. A very narrow shoe size.
3. The highest credit rating given by debt analysis agencies such as Standard & Poor's, Moody's, and A.M. Best.
4. A quality video game expected to sell well, typically with a higher budget than budget software.

1. American Automobile Association
2. anti-aircraft artillery
3. Amateur Athletic Association
4. Abdominal Aortic Aneurysm
5. Access All Areas, Sony music project
6. Access Approval Authority
7. Accumulated Adjustments Account, in US Federal Income Tax
8. Acquisition Approval Authority
9. Action Awareness Alert
10. Adaptive Array Antenna
11. Administration, Authorization, and Authentication, in software security
12. Advanced Acoustic Array
13. AEGIS Acquisition Agent
14. Aerospace Engineering, Applied Mechanics, and Aviation
15. Age Anaesthesia Association
16. Air Avenue of Approach
17. Airborne Array Aperture
18. Airborne Assault Area
19. Aircraft Alert Area
20. Airport Airspace Analysis
21. Alaska Activities Adventures Plus Tours
22. Allocations, Assessments, and Analysis
23. Alternate Assembly Area
24. Angle Angle Angle, a geometric proof
25. Area Agency on Aging
26. Arrival and Assembly Area
27. Army Audit Agency
28. Aromatic Amino Acid
29. Assign Alternate Area
30. Association of Avatar Artists
31. Astronaut-Actuated Abort
32. Atheist and Agnostic Association
33. Attitude, Awareness and Accountability, a ski safety program
34. Authentication, Authorization and Accounting
35. Authorization Accounting Activity
36. Authorized Accounting Activity
37. Automated Airlift Analysis
38. Automobile Association of America (USA)
39. Autoridad de Acueductos y Alcantarillados (Aqueduct and Sewer Authority, Puerto Rico)
40. Awaiting Aircraft Availability
41. Allied Artists' Association
42. American Abstract Artists
43. American Academy of Actuaries
44. American Academy of Addictionology
45. American Academy of Advertising
46. American Academy of Audiology
47. American Accounting Association
48. American Allergy Association
49. American Ambulance Association
50. American Armwrestling Association
51. American Association of Anatomists
52. American Audit Associates
53. ANSI Artists of America
54. Anticipative Adaptive Array, in frequency-hopping communications
55. Antique Airplane Association
56. Antique Automobile Association
57. Appraisers Association of America
58. Arkansas Ambulance Association
59. Australian Association of Accountants
60. Australian Automobile Association