| Abbreviation | Definition |
|---|---|
| ACSI | American Customer Satisfaction Index |
| ACT | America Coming Together |
| ACW | American Civil War |
| ACYF | Administration for Children, Youth, and Families |
| AD | After Democracy |
| AD | Allowable Deductions |
| AD | Anti Dumping |
| ADA | Americans with Disabilities Act |
| ADAA | Anxiety and Depression Association of America |
| ADAAG | Americans with Disabilities Act Accessibility Guidelines |
| ADAMS | Agencywide Document Access and Management System |
| ADC | After Date of Contract |
| ADC | Aid to Dependent Children |
| ADD | Administration on Developmental Disabilities |
| ADDD | Assistant Director for Detention and Deportation |
| ADDI | American Dream Downpayment Initiative |
| ADDI | Assistant District Director For Investigations |
| ADDNL | Additional |
| ADDNL | Additionally |
| ADECA | Arms Export Control Act |