| Abbreviation | Definition |
|---|---|
| A | form A (normally open) contacts |
| A/D | Analog-to-Digital converter |
| AA | AMD Assured |
| AA | AMD Athlon processor |
| AAA | Adequation Algorithm Architecture |
| AAA | Advanced Accelerator Applications |
| AAA | Algorithm Architecture Adequation |
| AAC | Apple Audio CODEC |
| AAM | Automatic Acoustic Management |
| AAUI | Apple Attachment Unit Interface |
| ABC | Atanasoff Berry Computer |
| ABC | Automatic Brightness Control |
| ABCB | Air Blast Circuit Breaker |
| ABCDE | A Better Compact Disk Encoder |
| ABIST | Array Built-In Self Test |
| ABR | Automatic BIOS Recovery |
| ABS | Airport Base Station |
| ABS | Automatic Backup System |
| ABU | Auxiliary Back-Up Unit |
| ABUS | Address Bus |