| AA | Aluminum Association | - | Computer Acronyms(common) |
| AA | Assistance Administration | - | Computer Acronyms(common) |
| AA | Assistant Administrator | - | Computer Acronyms(common) |
| AA | Activation Analysis | - | Computer Acronyms(common) |
| AA | Atomic Absorption | - | Computer Acronyms(common) |
| AA | Assisted Ascent | - | SMS Chat and Text |
| AA | Achieved Availability - Alcoholics Anonymous -Armed Forces Americas (postal Symbol) - Aruba (FIPS 10-4 Territory Code) -Assembly Area - Automobile Association- Avenue Of Approach | - | Astronomy |
| AA | Afar Language (ISO 639-1 Code) | - | Astronomy |
| AA | Attoampere | - | Astronomy |
| AA | Access Authorization | - | Business and Finance |
| AA | Accountable/activity Area | - | Business and Finance |
| AA | Activity Area | - | Business and Finance |
| AA | Adverse Action | - | Business and Finance |
| AA | Affirmative Action | - | Business and Finance |
| AA | Assistant Administrator | - | Business and Finance |
