| Acronym | Meaning |
| HDF | Halogenated Dibenzofuran(s) |
| NDLM | Nondiagonal Lagrange Multiplier |
| MIG | Metal Inert Gas (welding) |
| APCD | Air Pollution Control District |
| NGPSA | Natural Gas Pipeline Safety Act |
| ETV | Electrothermal Vaporization |
| AE-CI | All Electron-configuration Interaction |
| MIOSA | Modified (rotational) Infinite Order Sudden Approxn. |
| TGMA | Task Group Of Metal Accumulation |
| LSDXS-SIC | Local-spin-density (with) Screened Exchange (and) Self-interactiond Correction |