| Acronym | Meaning |
| RDA | Regularized Discriminant Analysis |
| EGCR | Experimental Gas-cooled Reactor |
| PTS | Phosphotransferase System |
| GVHD | Graft Versus Host Disease |
| MAPTAC | Acrylamide-N |
| HMG-COA | 3-hydroxy-3-methylglutaryl Coenzyme A |
| CNDO/2-U | Universal CNDO/2 (extended To Full Periodic Table) |
| APT | Analytic Perturbation Theory |
| BSA | Breathing-sphere Approxn. (for Inelastic Mol. Collisions) |
| TOTE | Tropical Ozone Transport Experiment |