| Acronym | Meaning |
| PDF | Probability-distribution Function |
| QBO | Quantitative Basis Orbital (an MO Or AO) |
| HWGTF | Hazardous Waste Groundwater Task Force |
| TSNIGRI | Research Center Of The Institute For Geol. Exploration Of Base And Precious Metals (Russia) |
| SCCSA | Self-consistent Central-site Approxn. (for D.-of-states) |
| ZDDO | Zero Diatomic Differential Overlap |
| ICMR | Indian Council Of Medical Research |
| CEA | Carcinoembryonic Antigen |
| AIDJEX | Arctic Ice Dynamics Joint Experiment |
| NRC | Nuclear Regulatory Commission |