| AAI | American Alpine Institute (skr.) |
|---|---|
| AAI | American Alpine Institution |
| AAI | Autodesk Approved Instructor |
| AAS | Against Assisted Suicide |
| ABI | American Butter Institute |
| ACI | Access Control Instruction |
| ACI | American Concrete Institute |
| ADI | Advanced Driving Instructor |
| ADI | American Defense Institute |
| ADI | American Documentation Institute (skr.) |