| Abbreviation | Definition |
|---|---|
| M- | Mega (1 Million) (prefix) |
| M(2) | Square Meter |
| M(3) | Cubic Meter |
| M/S | Meters Per Second |
| m/s | miles per second |
| m² | square metres |
| M³ | Cubic Meter |
| m³ | cubic metres |
| m³ | square metres |
| m3/H | Cubic Meters per Hour |
| MA | Mega Anna |
| MA | Mega Annum |
| MA | Millennia (Million years) Ago |
| MA | Millennia Ago |
| ma | milli ampere |
| mA | MilliAmpere |
| MAD | Mean Absolute Distance |
| MAF | Million Acre Feet |
| mAH | MilliAmp Hours |
| MAS | Max Array Size |