| Abbreviation | Definition |
|---|---|
| MG | Milligrams |
| MGD | Million Gallons per Day |
| MGO | Mega Gauss Oersteds |
| MGOe | Mega Gauss-OErsteds |
| MGSR | Metal Gear Solid Rising |
| mH | milliHenry |
| MH/YR | Man-Hours/Year. |
| MHAM | Million HectAre Meters |
| MHO | 1 / Ohms |
| MHP | Marine HorsePower |
| MHZ | MegaHertz |
| MI | Mile |
| MI | Miles |
| MI | Million |
| mi. | mile |
| MI2 | Square Miles |
| MiB | MebiByte |
| MIGD | Million Imperial Gallons per Day |
| MIGPD | Million Imperial Gallon Per Day |
| mil | Thousandth of an inch (=0.0254 mm) |