| Abbreviation | Definition |
|---|---|
| AL | Adult Literacy |
| AL | Asynchronous Learning |
| AL | Approach and landing |
| ALA | Alpha Linolenic Acid |
| ALA | AminoLevulinic acid |
| ALA | Academic Learning Assistant |
| ALA | American Literacy Association |
| ALA | Amebic Liver Abscess |
| ALAC | Apple Lossless Audio Codec |
| ALADP | Aminolevulinic Acid Dehydrogenase Deficiency Porphyria |
| ALADS | Association for Los Angeles Deputy Sheriffs |
| ALAE | Atmospheric Lyman Alpha Experiment |
| ALAE | Atmospheric Lyman-Alpha Emissions |
| ALAE | Atmospheric LymanAlpha Emissions |
| ALAP | Appletalk-localtalk Link Access Protocol |
| ALARS | Alaska Land and Resources System |
| ALAS | Automatic Landing Autopilot Subsystem |
| ALAS | Approach Landing Autopilot System (Subsystem) |
| ALAS | Alex Lovell Appreciation Society |
| ALAT | ALanine AminoTransferase |
| ALAWON | American Library Association Washington Office Newsletter |
| ALB | Anti Lock Brake |
| ALB | Albany County Airport |
| ALB | Anti Lock Brakes |
| ALB | Anti Lock Braking |
| ALBA | Alternating Linear Bounded Automaton |
| ALBM | Air-to-land Ballistic Missile |
| ALBO | Automatic Line Buildout |
| ALC | Audio Limiter Control |
| ALC | Audio Library Context |
| ALC | Approximate Lethal Concentration |
| ALC | Accredited Land Consultant |
| ALC | Automatic Light Control |
| ALC | Automatic Level Control (Camera) |
| ALC | Augmented Landing Site |
| ALC | Audio Load Compensator |
| ALC | Air Logistics Center |
| ALC | Aft Load Controller |
| ALC | Automatic Level Control |
| ALC | Area Learning Center |
| ALC | Airline Link Control |
| ALC | Assembly Language Coding |
| ALC | Automatic Load Control |
| ALCA | Automatic Level Control Assembly |
| ALCA | Aft Load Control Assembly |
| ALCL | Anaplastic Large Cell Lymphoma |
| ALCM | Air Launched Cruise Missile |
| ALCO | Asset/Liability Management Committee |
| ALCS | Authors Licensing Collecting Society |
| ALCS | American League Championship Series |