| A D A C Laboratories | Business |
| Allgemeine Deutscher Automobil-Club (General German Automobile Association) | Business |
| Art Dealers Association of Canada | Business |
| Abu Dhabi Airports Company | Business |
| Association Dues Assurance Corporation | Business |
| Alzheimers Disease Assistance Coalition | Community |
| Aesthetic Dermatology Academy Conference | Community |
| Allgemeine Deutsche Automobil Club | Community |
| Auburn Development Advisory Committee | Community |
| Atlanta Decorative Arts Center | Community |
| Active Directory Administrative Center | Computing |
| Automatic Direct Analog Computer | Computing |
| Antioch Damage Assessment Center | General |
| Allgemeiner Deutscher Auto Club | General |
| Asociacion Automovilistica Y Deportiva de Catriel | General |
| Amateurs Dauphonois d'Automobiles de Collection | General |
| Asset Design and As Constructed | General |
| Arizona Dream Act Coalition | General |
| Asset Designed As Constructed | General |
| Advanced Data Analysis Centre | General |
| Audiovector Discreet Active Concept | General |
| Automatic Differentiation of Assembler Code | General |
| Arctic Domain Awareness Center | General |
| Analog to Digital to Analog Converter | General |
| Abu Dhabi Airport Company | General |
| Aerial Departure Arrival Control | General |
| Asset Design As Constructed | General |
| Associate Deans Academic Council | Governmental |
| Alcoholism and Drug Abuse Council | Governmental |
| Ammunition Descriptive Asset Codes | Governmental |
| Allgemeiner Deutscher Automobil Club | International |
| Allergic Disease and Asthma Center | Medical |
| Alcohol and Drug Assessment and Counselling | Medical |
| Antineoplastic Drug Administration Course | Medical |
| Alternative Drug and Alcohol Counseling | Medical |
| Average Daily Accommodation Charge | Real Estate |
| Aboriginal Drug and Alcohol Council | Regional |
| Advanced Digital Acoustic Coding | Softwares |
