| Acronym | Meaning |
| MCPP | (+/-)-2-(4-chloro-2-methylphenoxy)propionic Acid (REG: 7085190) |
| CAPTEX | Cross-Appalachian Tracer Experiment |
| IEL | Independent Electron (model In Ion-impact Ionization Calcns.) |
| DPD | Diethyl-p-phenylenediamine (test For Chlorine In Water) [93-05-0] |
| ACCCI | American Coke And Coal Chemicals Institute |
| GIAO | Gage-independent Atomic Orbital |
| GS | Gelius-Siegbahn (MO Approxn.) |
| VAWI | Variable Wavelength Interferometry |
| BOM | Biodegradable Organic Matter |
| RFE | Recursive Feature Elimination |