| Acronym | Meaning |
| QEEC | Quasimol. Extended Elementary Cell (for Electronic Structure Calcns. Of Crystals) |
| EC | Enzyme Commission |
| VMT | Vehicle Miles Traveled |
| CRMMA | Chemical Reference Material Manufacturers Association |
| NAPCA | National Air Pollution Control Administration |
| ICP-MS | Inductively Coupled Plasma Mass Spectrometry |
| CEEC | Capillary Electrophoresis/electrochemistry |
| XMLD | X-ray Magnetic Linear Dichroism |
| DEF | Dose Effect Factor |
| FMO | Floating Molecular Orbital |