A2LA: American Association for Laboratory Accreditation
AA: Aluminium Association
AA: Alzheimer's Association
AAA: Age Anaesthesia Association
AAA: American Allergy Association
AAA: American Anthropological Association
AAA: American Arbitration Association
AAA: American Association of Anatomists
AAAASF: American Association for Accreditation of Ambulatory Surgery Facilities
AAABEM: American Association of Acupuncture and Bio-Energetic Medicine
AAACN: American Academy of Ambulatory Care Nursing
AAAD: American Athletic Association of the Deaf
AAAH: American Association of Alternative Healers
AAAHC: Accreditation Association for Ambulatory Health Care
AAAI: American Association for Artificial Intelligence
AAALAC: Association for Assessment and Accreditation of Laboratory Animal Care International
AAALF: American Association for Active Lifestyles and Fitness
AAAM: Association for the Advancement of Automotive Medicine
AAAS: American Association for the Advancement of Science
AAAST: African Association for the Advancement of Science and Technology
AABA: American Anorexia Bulimia Association
AABB: American Association of Blood Banks
AABCP: American Association of Breast Care Professionals
AABH: Association for Ambulatory Behavioral Healthcare
AABIC: Association for the Advancement of Brain Injured Children
AABP: American Association of Bovine Practitioners
AABSS: American Association of Behavioral and Social Sciences
AACA: Army Air Corps Association
AACA: Asian American Civic Association
AACA: Atlanta Area Compensation Association
AACA: Australasian Association of Campus Activities
AAcA: Australian Acupuncture Association
AACA: Australian Association of Consulting Archaeologists
AACA: Authentic Artifact Collectors Association
AACB: Australasian Association of Clinical Biochemists
AACC: American Association for Clinical Chemistry
AACC: American Association for Continuity of Care
AACDP: American Association of Chairs of Departments of Psychiatry
AACE: American Association for Cancer Education
AACE: American Association of Clinical Endocrinologists