| Abbreviation | Definition |
|---|---|
| AB | American Borders |
| ABAI | American Board of Allergy and Immunology |
| ABC | Activity Based Costing |
| ABCC | Alcoholic Beverage Control Commission |
| ABCC | Atomic Bomb Casualty Commission |
| ABD | As- Built Drawing |
| ABFI | Advance Briefing For Industry |
| ABFI | Advanced Briefing For Industry |
| ABG | Automatic Bus Grant |
| ABL | Allocated BaseLine |
| ABL | Anti-Broads Libbery |
| ABM | Activity-Based Management |
| ABMC | American Battle Monuments Commission |
| ABP | American Board of Paediatrics |
| ABR | Automatic Budget Reallocation |
| ABS | Anti Blocking System |
| ABSIE | American Broadcasting Station In Europe |
| ABU | Accepted, But Unusable |
| AC | After the Cataclysm |
| AC | Agency Characteristic |