| Acronym | Meaning |
| MMT | Methylcyclopentadienylmanganese Tricarbonyl |
| GREAT-ER | Geog.-referenced Regional Exposure Assessment Tools For European Rivers |
| GTO | Gaussian-type Orbital |
| MOVB | MO-valence Bond |
| PIANO | Paraffin |
| ARUPS | Angle-resolved Ultraviolet Photoelectron Spectroscopy |
| LOTOS | Long Term Ozone Simulation |
| TDO | Truncated Diatomic Orbital (a MO) |
| FELV | Feline Leukemia Virus |
| CDP | Contracted Density Product (in Simplification Of MO Calcns.) |