| Acronym | Meaning |
 | AJD | Astronomical Julian Day |
| AJP | Allied Joint Publication |
| AK | Akan Languages (ISO 639-1 Code) |
| AK | Alaska (postal Symbol) |
| AK | Attokelvin |
| AKA | Akan Languages (ISO 639-2 Code) |
| AKA | Above Knee Amputation (orthopaedic Usage) |
| AKDT | Alaska Standard Daylight Saving Time (UTC-8 Hours) |
| AKST | Alaska Standard Time (UTC-9 Hours) |
| AL | Alabama (postal Symbol) - Albania (FIPS 10-4 Country Code; ISO 3166 Digram) -Anno Lucis (Latin |
| AL | Aluminium |
| AL | Attolitre |
| ALA | land Islands (ISO 3166 Trigram) |
| ALAP | As Long/Late As Possible |
| ALARM | Air-Launched Anti-Radar Missile |
| ALB | Albania (ISO 3166 Trigram) |
| ALD | Accounting Line Designator (nuclear Weapon Targeting) |
| ALERT | Advanced Linked Extended Reconnaissance And Targeting - Attack And Launch Early Reporting To Theatre |
| ALF | Africa Leadership Forum - Alien Life Form - Animal Liberation Front |
| ALGOL | ALGOrithmic Language |
| ALL | Albanian Lek (ISO 4217 Currency Code) |
| ALOC | Air Lines Of Communication |
| ALOC | Average Length Of Call |
| ALS | Amyotrophic Lateral Sclerosis - Automatic Landing System |
| ALSP | Aggregate Level Simulation Protocol |
| ALTACS | Automated Decision Logic Tactical Air Combat Simulation |
| ALTE | Association Of Language Testers In Europe |
| AM | Americium |
| AM | Amharic Language (ISO 639-1 Code) - Attometre |
| AM | Many |
| AMA | American Medical Association |
| AMAPS | Aircraft |
| AMC | Adaptive Modulation And Coding (digital Communications) - U.S. Air Mobility Command - American Motors Corporation - U.S. Army Materiel Command |
| AMCB | U.S. Army/Marine Corps Board |
| AMD | Advanced Micro Devices - Age-related Macular Degeneration -Armenian Dram (ISO 4217 Currency Code) |
| AMF | Afghan Military Force |
| AMFOM | Advanced Missile Fly Out Model (am-fomm) |
| AMFR | Age-specific Marital Fertility Rate - Amplitude Modulation Following Response |
| AMFRS | Advanced Multi-Function Radio Frequency System - Automatic Multisensor Feature-based Recognition System |
| AMH | Amharic Language (ISO 639-2 Code) |
| AML | Acute Myeloid Leukaemia |
| AMLCD | Active Matrix Liquid Crystal Display |
| AMO | Atlantic Multidecadal Oscillation |
| AMOS | Advanced MOrtar System - Air Force Maui Optical And Supercomputing Observatory |
| AMP | Adenosine MonoPhosphate - Automated Mission Planner |
| AMRAAM | Advanced Medium-Range Air-to-Air Missile |
| AMRDEC | U.S. Aviation & Missile Research |
| AMS | Agriculture Marketing Service - American Mathematical Society |
| AMSAA | U.S. Army Materiel Systems Analysis Activity |
| AMSO | U.S. Army Model And Simulation Office |
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