| Acronym | Definition |
|---|
| HDDA➣Heavy Duty Distribution Association (Bethesda, MD) |
| HDDA➣Hexanediol Diacrylate |
| HDDA➣Hartsville Downtown Development Association (South Carolina) |
| HDDA➣Horrex Davis Design Associates Ltd. (graphic design agency; UK) |
| HDDA➣Hierarchical Dynamic Distributed Array |
| HDDA➣High Definition Digital Audio |