| Acronym | Meaning |
| MMR | Mismatch Repair |
| ENAC | Energetic Neutral Atom Camera |
| ICRU | International Commission On Radiation Units And Measurements |
| POL-CI | Polarization Configuration Interaction |
| ECP | Effective Core Potential Approxn.(in Electronic-structure Calcn.) |
| NODC | National Oceanographic Data Center (Washington |
| ADEOS | Advanced Earth Observing Satellite |
| RACER | Research On Antarctic Coastal Ecosystem Rates |
| OTDR | Optical Time Domain Reflectometry |
| PIMA | Polyisocyanurate Insulation Manufacturers Association |