| Abbreviation | Definition |
|---|---|
| AI | Electromagnetic Intrusion |
| AIC | Analytical Instrument Control |
| AICF | Acoustic Inertial Confinement Fusion |
| AID | Also Includes Drugs |
| AIF | Assumed Internal Force |
| AIM | Accurate, Intentional, Measurable |
| AIM | Advanced Idea Mechanics |
| AIP | American Institute of Physics |
| AJP | American Journal of Physics |
| AKD | Altered Kinetic Distance |
| AKMC | Atomic Kinetic Monte Carlo |
| AKMC | Atomistic Kinetic Monte Carlo |
| AL | Argon Laser |
| ALARA | As Long As Radiation Allows |
| ALARM | A Loud Automatic Repetitive Message |
| ALB | Anti Lock Brake |
| ALICE | A Large Ion Collider Experiment |
| ALPS | Applications And Libraries For Physics Simulations |
| ALR | Active Lead Ring |
| ALU | Applied Laser Unit |