| Abbreviation | Definition |
|---|---|
| LADD | Linear to Angular Displacement Device |
| LAF | laminar air flow |
| LAQL | Lowest analytically quantifiable level |
| LARP | LHC Accelerator Research Program |
| LASP | Low Atomizing Steam Pressure |
| LAT | Lowest Achievable Temperature |
| LB | Laser Beam |
| LB | Laser Box |
| LB | Line Broadening |
| LBNE | long baseline neutrino experiment |
| LBNE | Long-baseline Neutrino Experiment |
| LBS | Lipid Binding Site |
| LC | Lateral Confinement |
| LCAP | Laser Cooling and Atomic Physics |
| LCED | Liquid Chromatography and Electrochemical Detection |
| LCF | Load Combination Factor |
| LCL | Lamp Center Length |
| LCL | Lifting Condensation Level |
| LCLS | Linac Coherent Light Source |
| LCM | Linear Conservation of Momentum |