| Ada Developers Academy | Academic & Science |
| Australian Dental Association | Academic & Science |
| American Dairy Association | Academic & Science |
| Architects and Designers Association | Academic & Science |
| A Dumb Answer | Academic & Science |
| Automated Degree Audit | Academic & Science |
| Athletes Demand Action | Academic & Science |
| Developers Academy | Academic & Science |
| Associate Dean Academic | Academic & Science |
| Adana | Airport Code |
| Advance Deposit Account | Banking |
| Acadian Mining Corporation | Business |
| Adacel Technologies, LTD. | Business |
| Audio Design Associates | Business |
| Annemarie's Dance Academy | Business |
| American Dental Association | Business |
| Analog Digital Associates | Business |
| Athletic Dealers of America | Business |
| Alaska Division of Agriculture | Business |
| Arriyadh Development Authority | Business |
| Azodicarbonamide | Chemistry |
| American Diabetes Association's | Community |
| American Diabetes Association | Community |
| Applauding Deaf Artists | Community |
| International IEEE Conference on ADA Applications and Environments | Community |
| Average Daily Attendance | Community |
| American Dietetic Association | Community |
| Americans with Disabilities Act | Computer and Networking |
| Language after Augusta Ada Byron, computer pioneer | Computing |
| Automatic Data Capture | Computing |
| Analog Digital Analog | Computing |
| Cardano | Computing |
| Automatic Data Acquisition | Computing |
| Audio Distribution Amplifier | Computing |
| Active Directory Schema Attributes | Computing |
| Administration Agent | Computing |
| Application Developers Alliance | Computing |
| Advanced Distribution Automation | Computing |
| Adobe Download Assistant | Computing |
| Analytics Data Advertising | Computing |
| Advanced Data Analytics | Computing |
| Advanced Data Access | Computing |
| A Detection Algorithm | Computing |
| Ada Language Source Code File | File Type |
| ADvisory Airspace | General |
| Another Day Again | General |
| Architects Drinking Alcohol | General |
| Ageing Dodering Alzhimic | General |
| Another Darn Attorney | General |
| American Dollars for Attorneys | General |
| Another Dumb Acknowledgement | General |
| Attorneys Dreams Answered | General |
| A Darling Actress | General |
| Amg Driving Academy | General |
| Automotive Design Awards | General |
| Advanced Drivers Association | General |
| Adaptive Driving Access | General |
| Abarth Driving Academy | General |
| Auto Dell'Anno | General |
| Active Distance Assist | General |
| Adaptive Driving Alliance | General |
| Auto Damage Appraiser | General |
| Aftermarket Distributors Alliance | General |
| Adaptive Driving Association | General |
| Approach and Departure Angle | General |
| Autoliv Development Ab | General |
| Automotive Distributors Association | General |
| Anello Di Accumulazione | General |
| Airtight Drywall Approach | General |
| Automated Design of Algorithms | General |
| Advanced Delivery Alert | General |
| Active Driving Assist | General |
| Advanced Driver Assistance | General |
| Advanced Driving Academy | General |
| Advanced Drive Assist | General |
| Americans with Disabilities Act of 1990 | Governmental |
| Americans for Democratic Action | Governmental |
| Assistant District Attorney | Governmental |
| Aeronautical Development Agency | Governmental |
| Aviation Data and Analysis System | Governmental |
| Alternatives to Domestic Aggression | Governmental |
| Anti Deficiency Act | Governmental |
| American Disability Act | Governmental |
| Anno Domini Aquarii | International |
| Arbeitsgemeinschaft Deutscher Aufbereitungs | International |
| Apprentice Dark Angel | Jobs |
| Alcohol Dependence/Abuse | Medical |
| Anti-Diuretic Activity | Medical |
| American Diabetes | Medical |
| Adenosine Deaminase A | Medical |
| Anterior Descending Artery | Medical |
| Air Defense Artillery | Military and Defence |
| Air Defense Area | Military and Defence |
| After Date of Award (of Contract) | Military and Defence |
| Angehorige Der Armee | Military and Defence |
| Aerial Damage Assessment | Military and Defence |
| Alcoholism and Drug Abuse Division | Regional |
| Adangme | Regional |
| Adana Armenia | Regional |
| Programming Language Named After Lady Ada Augusta Byron | Softwares |
| Anti Deer Association | Sports |
| Alamo Dressage Association | Sports |
| Adana Airport | Transport & Travel |