| Abbreviation | Definition |
|---|---|
| ACUA | Association of College University Auditors |
| ACUA | Association of College & University Auditors |
| ACVSMR | American College of Veterinary Sports Medicine and Rehabilitation |
| ACWWA | Atlantic Canada Water and Wastewater Association |
| ADA | American Dental Association |
| ADA | Audio Design Associates |
| ADAA | American Dental Assistants Association |
| ADAA | Art Dealers Association of America |
| ADAC | Art Dealers Association of Canada |
| ADATP | Advanced Automotive Trainer Professional |
| ADCA | Aerospace Department Chairs Association |
| ADCA | American Dental Coders Association |
| ADCA | American Distance Counseling Association |
| ADCA | American Dream Community Agency |
| ADCD | Art Directors Club of Denver |
| ADCS | Association of Director of Children’s Services |
| ADCS | Association of Director of Childrens Services |
| ADDF | Alzheimer's Drug Discovery Foundation |
| ADE | Associate Distribution Engineer |
| ADEA | American Dental Education Association |