| Acronym | Meaning |
| ESM | Exponential-series Method |
| GCLDA | Gradient-corrected Local Density Approximation |
| TARC | Tiered Area Response Capability |
| MP2-R12 | MP2 Theory With Terms Linear In Interelectronic Distance (r12) |
| IAP | Intermittent Aeration Process (for Waste Treatment) |
| IRIM | Institute For Rare Isotope Measurements |
| DDTA | Derivative Differential Thermal Analysis |
| CCN | Cloud Condensation Nucleus |
| SAES | State Agricultural Experiment Stations |
| AQS | Ambient Quality Standard |