| Abbreviation | Definition |
|---|---|
| MASL | Meters Above Sea Level |
| MAU | Milli Absorbance Units |
| MAU | Milli-Absorbance Unit |
| MAXX | Lingerie Plus sizes |
| Mb | Megabits |
| MB | MegaBytes |
| MBA | Mean Binary Accuracy |
| MBD | Million Barrels per Day |
| MBF | Measured Board Foot |
| MBH | Thousand BTU per Hour |
| MBIT/S | Megabits Per Second |
| MBOPD | Million Barrel of Oil Per Day |
| MBOPD | Million Barrels of Oil Per Day |
| Mbps | MegaBits Per Second |
| mBq | MilliBecquerel |
| MCA | Marine Cranking Amperes |
| MCA | Minimum Circuit Amps |
| Mcal | MegaCalorie |
| MCB | Meter Cover Box |
| MCD | Meters Composite Depth |