| Acronym | Meaning |
 | ABAQUS | Finite-element Computer Code |
| ABB | Asea Brown Boveri |
| ABC | Aerobiochemical |
| ABC | Accelerator-based Conversion |
| ABC | Advanced Ball Concept |
| ABE | Army Background Experiment |
| ABES | Alliance For Balanced Environmental Solutions |
| ABFEL | Air-based Free-electron Laser |
| ABHX | Air Blast Heat Exchanger |
| ABL | Airborne Laser |
| ABL | Atmospheric Boundary Layer |
| ABLE | Activity Balance Line Evaluation |
| ABLE | Amazon Boundary Layer Experiment |
| ABLE-2B | Arctic/Atlantic/Atmospheric Boundary Layer Experiment |
| ABM | Antiballistic Missile |
| ABRES | Advanced Ballistic Re-entry System |
| ABRV | Advanced Ballistic Re-entry Vehicle |
| ABS | Automatic Backup Shutdown |
| ABS-SC | Automatic Backup Shutdown Of Safety Computer |
| ABTRES | Abatement & Residual Forecasting Model |
| ABV | Auxiliary Building Ventilation |
| ABWA | American Business Women's Association |
| AC | Alternating Current |
| AC | Adirondac Conference |
| AC | Actual Commitment |
| AC | Advisory Circular/committee |
| AC | Alternating Current |
| AC | Ancho Canyon |
| AC | Area Coordinator |
| ACA | Atmospheric Chemistry Of Aerosols |
| ACA | American Conservation Association |
| ACA | Applied Combinatorial Analysis |
| ACACIA | A Consortium For The Application Of Climate Impact Assessments |
| ACAP (ACAPS) | Advanced Computer For Array Processing |
| ACARS | ARINC Communications And Relay System |
| ACARS | ARINC Communication |
| ACAS | Advisory Committee For Atmospheric Sciences |
| ACATS | Airborne Chromatograph For Atmospheric Trace Species |
| ACB | Air-operated Circuit Breaker |
| ACBM | Asbestos-containing Building Material |
| ACC | Abnormal Condition Control |
| ACC | Abrupt Climate Change |
| ACC | Antarctic Circumpolar Current |
| ACC | Accumulator |
| ACCD | Aircraft Compatibility Control Drawing |
| ACCENT | Atmospheric Chemistry Of Combustion Emissions Near The Tropopause |
| ACD | Atmospheric Chemistry Division |
| ACD | Advanced Conceptual Design |
| ACDA | Arms Control And Disarmament Agency |
| ACDAR | Acoustic Radar |
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