| Abbreviation | Definition |
|---|---|
| AMTI | Apostolic Missionary Training Institute |
| AMTI | Arizona Medical Training Institute |
| AMTIE | American Medical Technologists Institute for Excellence |
| ANDI | Associates of National Dance Institute |
| ANDT | Advanced Institute of Nondestructive Testing & Training |
| ANEI | Antioch New England Institute |
| ANI | Annual National Institute |
| ANI | Armenian National Institute |
| ANICAN | African Negotiation Institute and Chartered Academy of Negotiators |
| ANITA | Australian National Institute for Theoretical Astrophysics |
| ANLI | All Nations Leadership Institute |
| ANSI | . American National Standard Institute |
| ANSI | American National Safety Institute |
| ANSI | American National Security Institute |
| ANSI | American National Standards Institute |
| ANSI | American National Standars Institute |
| AOCI | Allen Oakwood Correctional Institution |
| APAARI | Asia Pacific Association of Agricultural Research Institutions |
| APDI | African Peace and Democratic Institute |
| APFI | Asia pacific film institute |