| Abbreviation | Definition |
|---|---|
| LVTS | Lehigh Valley Transportation Study |
| LVV | Low Volume Vehicle |
| LVW | Loaded Vehicle Weight |
| LW | Loaded Weight |
| LWB | Large Wide Body or Wide-body aircraft |
| LWB | Locking Wheel Bolts |
| LWB | Long Win Bus |
| LWJ | Low Wing Jack |
| LWL | Load WaterLine |
| LWTC | Liquid Waste Tank Car |
| LX | Linear X |
| M | Maritime |
| M | Methyl |
| M | Motor |
| M- | Motorway |
| M&R | Maintenance and Repair |
| M5 | Manual Five Speed |
| M85 | 85 Percent / 15 Percent Unleaded Gasoline |
| MAA | Maryland Aviation Authority |
| MAA | Maximum Authorized Altitude |