| Abbreviations | Meaning |
 | ACTA | Assertive Community Treatment Association |
| ACTA | Association Of Cardiothoracic Anaesthetists |
| ACTA | Australian Chemical Trauma Alliance |
| ACTM | Australasian College Of Tropical Medicine |
| ACTTSA / CAAHTT | Association Canadienne Des Techniciens Et Technologistes En Santé Animale / Canadian Associatioon Of Animal Health Technologists And Technicians |
| ACTUR | Automated Central Tumor Registry |
| ACU | Association Of Clinicians For The Underserved |
| ACUC | Associació Catalana D'Uròlegs De Comarques |
| ACURP | American College Of Utilization Review Physicians |
| ACVA | American College Of Veterinary Anesthesiologists |
| ACVCP | American College Of Veterinary Clinical Pharmacology |
| ACVECC | American College Of Veterinary Emergency And Critical Care |
| ACVIM | American College Of Veterinary Internal Medicine |
| ACVM | American College Of Veterinary Microbiologists |
| ACVO | American College Of Veterinary Ophthalmologists |
| ACVP | American College Of Veterinary Pathologists |
| ACVPM | American College Of Veterinary Preventive Medicine |
| ACVR | American College Of Veterinary Radiology |
| ACVS | American College Of Veterinary Surgeons |
| ACVT / TVAC | Association Canadienne Des Victimes De La Thalidomide / Thalidomide Victims Association Of Canada |
| ADA | American Dental Association |
| ADA | American Diabetes Association |
| ADA | American Dietetic Association |
| ADA | Americans With Disabilities Act |
| ADA | Association Of Dialysis Advocates |
| ADA | Australian Dental Association |
| ADA CERP | American Dental Association Continuing Education Recognition Program |
| ADA+C | Alberta Dental Association And College |
| ADA+C | Alberta Dental Association And College |
| ADAA | Alberta Dental Assistants Association |
| ADAA | American Dental Assistants Association |
| ADAA | Anxiety Disorders Association Of America |
| ADAAF | American Dental Assistants Association Foundation |
| ADAD | Alzheimer Disease And Associated Disorders [periodical] |
| ADAL | Authorized Dental Allowance List |
| ADAM | Animated Dissection Of Anatomy For Medicine (NLM) |
| ADAPEI | Association Départementale De Parents Et Amis De Personnes Handicapées Mentales |
| ADARA | Professionals Networking For Excellence In Service Delivery With Individuals Who Are Deaf Or Hard Of Hearing [Previously: American Deafness And Rehabilitation Association] |
| ADARPEF | Association Des Anesthésistes Réanimateurs Pédiatriques D'Expression Française. Association Of French Speaking Paediatric Anaesthetists |
| ADBS | Association Des Professionnels De L'Information Et De La Documentation |
| ADC | Alzheimer's Disease Center |
| ADC | Archives Of Diseases In Childhood |
| ADC / CDA | Association Dentaire Canadienne / Canadian Dental Association |
| ADC-ENSP | Association Des Directeurs Certifiés De L'ENSP (École Nationale De La Santé Publique) |
| ADCA | Alcohol And Other Drugs Council Of Australia |
| ADCN | Academic Dental Careers Network |
| ADCRO | Association Pour Le Développement De La Chirurgie Réparatrice Et Orthopédique |
| ADCS | Alzheimer's Disease Cooperative Study |
| ADCS | Army Dental Care System |
| ADD | Administration On Developmental Disabilities |
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