| Abbreviation | Definition |
|---|---|
| MV | Motion Vector |
| MWE | Meters of Water Equivalent |
| MWI | Many Worlds Intersecting |
| MWI | Many-Worlds Interpretation |
| MWIR | Medium Wavelength Infrared |
| MWNT(s) | multi-wall nanotube(s) |
| MWTN | Many World Theory -Nature |
| MY | Mattocks And Young |
| N | Neutrino |
| N | Normal |
| NA | Neutral Axis |
| NAA | Neutron Activation Analysis |
| NACLH2O | Sodium Cloride Water solution |
| NACME | Non Adiabatic Coupling Matrix Elements |
| NACT | Nonlinear Asymptotic Coupling Theory |
| NAD | Nihilistic Animation Data |
| NAM | Nihilistic Animated Material |
| NANO | Nanostructural Analysis Network Organisation |
| NAPS | National Association of Physics Students |
| NAS | Net Analyte Signal |