| Abbreviation | Definition |
|---|---|
| ADAO | Anxiety Disorder Association of Ontario |
| ADAO | Anxiety Disorders Association of Ontario |
| ADAPEI | Association départementale de parents et d'amis des personnes handicapées mentales |
| ADAPT | Architectural Design Association of Portugal Turkey |
| ADAPT | Association of Digital Artists Professionals and Technicians |
| ADAQ | Australian Dental Association Queensland |
| ADARA | American Deafness and Rehabilitation Association |
| ADAS | Association des Doctorants et Assistants en Sciences |
| ADBA | American Dog Breeders Association |
| ADBA | American Dragon Boat Association |
| ADBA | Anaerobic Digestion and Biogas Association |
| ADBA | Anaerobic Digestion and Bioresources Association |
| ADBA | Anaerobic Digestion Bioresources Association |
| ADBA | Australian Defence Basketball Association |
| ADCA | Aerospace Department Chair Association |
| ADCA | Association Of Dominican Classical Artists |
| ADCA | Athletic Directors and Coaches Association |
| ADCCP | Association of Data Center Cleaning Professionals |
| ADCS | Association of Director of Children’s Services |
| ADCS | Association of Director of Childrens Services |