| Acronym | Meaning |
| R-CNDO/1X | Relativistic Complete Neglect Of Differential Overlap (method) |
| CBIRF | US Marine Corps' Chem/Bio Incident Response Force |
| IWOP | Integration Within (an Ordered Product Of) Operators |
| GCEMC | Grand Canonical Ensemble Monte Carlo |
| ICEAS | Intermittent Cycle Extended Aeration System (activated Sludge) |
| UCM | Unresolved Complex Mixt. |
| HIMP | Heavy Ion Microprobe |
| BK | Brinkman-Kramers (approxn. In Ion-mol. Collision Quantum Calcn.) |
| CADD | Computer Aided Drug Design |
| MDH | Malate Dehydrogenase |