| Acronym | Definition |
|---|
| A&A | Art and Architecture |
| A&A | Astronomy and Astrophysics |
| A&A | Accounting and Auditing |
| A&A | Assessment and Authorization (various companies) |
| A&A | Ask & Answer (forums) |
| A&A | Archaeology and Anthropology |
| A&A | Aid and Attendance (VA benefit) |
| A&A | Additions and Amendments |
| A&A | Aly & AJ (pop singing sister duo) |
| A&A | Advertise and Award (NASA) |
| A&A | Acronyms & Abbreviations |
| A&A | Arrival and Assembly |
| A&A | Arcade & Attica (railroad) |
| A&A | Alteration & Addition |
| A&A | Ass and Alcohol (GI update of R&R) |
| A&A | Akasam & Associates (accountants, Hyderabad, India) |