| Acronym | Meaning |
| CDI | Chronic Daily Intakes |
| AU | Astronomical Unit |
| PCEM | Point-charge Electrostatic Model |
| RECP-CVC | Relativistic Effective-core Potential With Core-valence Correlation |
| OMMSQA | Office Of Modeling |
| WWEMA | Waste And Wastewater Equipment Manufacturers Association |
| CHAMPP | Computer Hardware |
| DMBE | Double Many-body Expansion (in Potential Energy Surface Calcn.) |
| ORAM | Optical Random Access Memory |
| AIR CHIEF | Air ClearingHouse For Inventories And Emission Factorspar |