| Acronym | Meaning |
| ARIMAX | Auto Regressive Integrated Moving Average With Exogeneous Input Model |
| TTS | T Tauri Star |
| CEELS | Core Electron Energy Loss Spectroscopy |
| AACC | American Association For Clinical Chemistry |
| MPD | Maximum Permissible Dose |
| ZHE | Zero-headspace Extractor (used In TCLP Determinations) |
| MCAO | Middle Cerebral Artery Occlusion |
| DASHO | Designated Agency Safety And Health Official |
| ITRI | Inhalation Toxicology Research Institute |
| SOP/ED | Split-operator Propagator (for) Electronically Diabatic (phenomena) |