| Abbreviation | Definition |
|---|---|
| L&A | Light And Accommodation |
| L&H | Lungs and heart |
| L&S | Liver and spleen |
| L&W | Living And Well |
| L-1 | 1st Lumbar Vertebra |
| L-2 | 2nd Lumbar Vertebra |
| L.A.C. | Line of Actual Control |
| L.C.A. | light Combat Aircraft |
| L.C.M. | Lowest Common Multiple |
| L.K.G. | Lower Kinder Garten |
| L.L.B. | Bachelor of Law |
| L/MIN | Liters Per Minute |
| L1 - L5 | Lumbar vertebrae 1 - 5 (spine eg. L1 = 1st lumbar vertebra) |
| LA | Language Arts |
| LA | Lanthanum |
| LA | Linoleic Acid |
| LA | Lactic Acid |
| LA | Load Address |
| LA | Logical Address |
| LA | Long Acting |
| LA | Lupus Anticoagulant |
| LA | LeukoAraiosis |
| LAA | Local Airport Advisory |
| LAAD | Los Angeles Aircraft Division |
| LAADS | Low Altitude Air Defence System |
| LAAS | Low Altitude Alert System |
| LABEL | modify, add or delete Volume Label |
| LAC | Line of Actual Control |
| LAC | Lose All Communication |
| LAC | Long Arm Cast |
| LACB | Landing Aids Control Building |
| LACIE | Large Area Crop Inventory Experiment |
| LACIP | Large Area Crop Inventory Program |
| LAD | Leukocyte Antibody Detection |
| LAD | Left Anterior Descending |
| LAD | Left Axis Deviation |
| LAD | Leukocyte Adhesion Deficiency |
| LADA | Latent Autoimmune Diabetes of Adults |
| LADC | Licensed Alcohol and Drug Counselor |
| LAE | Long Above Elbow (cast) |
| LAE | Left Atrial Enlargement |
| LAER | Lowest Achievable Emission Rate |
| LAFB | Left Anterior Fascicular Block |
| LAFB | Left Atrio Femoral Bypass |
| LAFTA | Latin American Free Trade Area |
| LAGEOS | Laser Geodynamic Satellite |
| LAGEOS | Laser Geodynamics Satellite |
| LAGOS | Laser Gravitational-Wave Observatory in Space |
| LAGS | Launch Abort Guide Simulation |
| LAGW | Load And Go Wrong |