| Acronym | Definition |
|---|
| AAI | Arab American Institute (Washington, DC) |
| AAI | American Association of Immunologists |
| AAI | Atheist Alliance International |
| AAI | All Appropriate Inquiry |
| AAI | AirTran Holdings, Inc. (Nevada and Florida) |
| AAI | Analisi Ambientale Iniziale (Italian: Initial Environmental Assessment) |
| AAI | Airport Authority of India |
| AAI | Accredited Adviser in Insurance |
| AAI | Afro Asiatisches Institut (German: Afro-Asian Institute; Austria) |
| AAI | American Antitrust Institute |
| AAI | Adjusted Available Income (student financial aid) |
| AAI | Authentication and Authorization Infrastructure |
| AAI | Alpine Ascents International (Seattle, WA) |
| AAI | Allied Armies in Itlay |
| AAI | Area of Archaeological Importance (UK) |
| AAI | Adoption Associates Inc (Jenison, MI) |
| AAI | Asian Arts Initiative (various locations) |
| AAI | Asia America Initiative (Washington, DC) |
| AAI | Airline Ambassadors International |
| AAI | Adoption Advocates International (Port Angeles, WA) |
| AAI | Alliance of American Insurers |
| AAI | Architectural Association of Ireland (Dublin, Ireland; est. 1896) |
| AAI | African-American Institute (formerly Institute of African American Relations, Washington DC) |
| AAI | Action Aid International (South Africa) |
| AAI | Adam Aircraft Industries |
| AAI | Ankle-Arm Index (atherosclerosis) |
| AAI | Asian American Institute |
| AAI | Agribusiness Association of Iowa |
| AAI | Advantest America, Inc. (various locations) |
| AAI | Autodesk Approved Instructor |
| AAI | Airline Automation Inc |
| AAI | Aristolochic Acid I (toxicology) |
| AAI | Alliance for Africa's Industrialization |
| AAI | Asosiasi Advokat Indonesia (Indonesian Advocates Association) |
| AAI | American Acrylic Injection Inc (Farmersville, TX) |
| AAI | Angle of Approach Indicator |
| AAI | Acute Alcohol Intoxication |
| AAI | Australians against Islam |
| AAI | Amerinex Applied Imaging, Inc |
| AAI | Arkansas Aging Initiative |
| AAI | Alliance for American Innovation |
| AAI | Alexandria Archive Institute (San Francisco, CA) |
| AAI | Arrival Aircraft Interval (air traffic control) |
| AAI | Asociación Argentina para la Infancia (Spanish) |
| AAI | AFAQ-AFNOR International |
| AAI | Administrative Authority Identifier |
| AAI | Abbreviations, Acronyms and Initialisms |
| AAI | Air-to-Air Interrogator |
| AAI | Alliance Academy International |
| AAI | American Atelier, Inc. (Allentown, PA) |
| AAI | Automated AUTODIN Interface |
| AAI | Armstrong Associates, Inc. |
| AAI | Air-to-Air Interface |
| AAI | Agent Administratif des Impôts (French: Tax Administrative Officer) |
| AAI | Automatic Accounting Instruction (J.D. Edwards) |
| AAI | Aortic Arch Interruption |
| AAI | Air-to-Air Intercept |
| AAI | Applications Alarms Infrastructure |
| AAI | Aircraft Armament Incorporated |
| AAI | Asean Australasia and India |
| AAI | Alternatives to Abortion International |
| AAI | All American Industries Company |
| AAI | Association des Anciens de l'Isty (French: Association of the Former students of ISTY, French school in Versailles) |
| AAI | Audit Action Item |
| AAI | Antenna-Air Interface |
| AAI | Agents Available Interval (Sprint) |
| AAI | Automated Acquisition Information |
| AAI | AMMRL Activity Identifier |
| AAI | Army Analysis Intelligence |
| AAI | Aesthetic Artist Interview |
| AAI | Airborne Alert Indoctrination |
| AAI | American Alpine Institution |
| AAI | All Actors Integration |
| AAI | Automobiles Anciennes de l'Indre (French automobile club) |
| AAI | Atlantique Automatismes Incendie (French: Atlantic Fire Automation; fire protection system company) |
| AAI | Automobile Association Ireland (est. 1910) |
| AAI | Agence Azur Investigations (French private detective agency; Nice, France) |