| Abbreviation | Definition |
|---|---|
| AC | Animal Control |
| ACAP | Alternative Cover Assessment Program |
| ACB | Amy Coney Barrett |
| ACC | American Center for Cities |
| ACCLPP | Advisory Committee On Childhood Lead Poisoning Prevention |
| ACCS | Army Command and Control System |
| ACD | AMVET (American VETerans) Code Dictionary |
| ACDA | United States Arms Control and Disarmament Agency |
| ACDF | Annual Compliance Determination Fee |
| ACE | AGOA Capacity Enhancement (US Department of Commerce Fellowship) |
| ACE | Assessing Cost-effectiveness |
| ACER | Acquisition Collaboration Experimentation Reflection |
| ACF | Administration for Children and Families |
| ACFR | Administrative Committee of the Federal Register |
| ACFY | After the Current Fiscal Year |
| ACGIH | American Conference of Governmental Industrial Hygienists |
| ACHDNC | Advisory Committee on Heritable Disorders in Newborns and Children |
| ACHP | Advisory Council on Historic Preservation |
| ACI | Advancing care information |
| ACIO | Advanced Contact Intelligence Organization |