| Abbreviation | Definition |
|---|---|
| AATI | Adolescent and Adult Time Inventory |
| AATIS | Advanced Air Transport Information System |
| AATIS | Automatic Add Token And Identifier Scheme |
| AATL | Adobe Approved Trust List |
| AATMA | Approach of Ashtavaidyan Thaikkattu Mooss to Ayurveda |
| AATN | Arizona Anti Trafficking Network |
| AATN | Assyrians And Their Neighbours |
| AATN | Avoidance of Address Translation in Networks |
| AATP | Advanced Available To Promise |
| AATP | All About The Presentation |
| AATP | Americans Against the Tea Party |
| AATP | Asian American Theater Project |
| AATP | Auction Agent Transfer Protocol |
| AATP | Authorized Academic Training Program |
| AATR | All About The Ride |
| AATR | Along Arc TEC Rate |
| AATR | An Affair To Remember |
| AATR | Artists at the Ready |
| AATS | Accreditation and training Services |
| AATS | Act Assurance Testing System |