| Acronym | Definition |
|---|
| HDAA➣High Definition Authoring Alliance (Sonic Solutions) |
| HDAA➣Health Data for All Ages (US CDC) |
| HDAA➣Help Desk Association Australasia |
| HDAA➣Her Death and After (band) |
| HDAA➣Hull and District Angling Association (UK) |
| HDAA➣Home Domain Allocation Agency |