| Acronym | Meaning |
| MRO | Medium Range Order |
| GMO | Generalized Molecular Orbital |
| MC-DWBA | Multichannel Distorted Wave Born Approxn. |
| NWSIA | National Water Supply Improvement Association |
| END | Electron Nuclear Dynamics (method In Atomic And Molecular Scattering Calcns.) |
| ESE | Extended-surface Electrolysis |
| ACAT | Acyl-CoA: Cholesterol Acyltransferase |
| IHO | International Hydrographic Association |
| EXFAS | Extended Fine Auger Structure |
| IMPDH | Inosine-5'-monophosphate Dehydrogenase |