| Abbreviation | Definition |
|---|---|
| ATT | Authority To Test For The |
| AUTHORITY | Authorities |
| AVI | Authority Volume Indexing |
| AWAKEN | Action with Authority Knowledge Empowerment and Newness |
| BAHA | Bay Area Headquarters Authority |
| BAI | Broadcast Authority of Ireland |
| BAI | Broadcasting Authority of Ireland |
| BANA | Braille Authority of North America |
| BANC | Balancing Authority of Northern California |
| BANT | Budget Authority Need and Time |
| BANT | Budget Authority Need and Timeframe |
| BANT | Budget Authority Need and Timeline |
| BANT | Budget Authority Need and Timescale |
| BANT | Budget Authority Need and Timing |
| BANT | Budget Authority Need Timeline |
| BANT | Budget Authority Needs and Timeline |
| BAO | Bereavement Authority of Ontario |
| BAOA | Botswana Accountancy Oversight Authority |
| BATA | Bay Area Toll Authority |
| BATA | Bay Area Transit Authority |