| Acronym | Meaning |
| DPA | Displacement Per Atom |
| CCWP-J | Close Coupling Wave Packet [in Total Angular Momentum] J [representation] (for Collision Calcns.) |
| IRM | Information Resources Management |
| IP | Impact Parameter Approximation |
| BIF | Banded Iron-formation |
| DQT | Dissipative Quantum Tunneling (theory) |
| EXPRES | Expert System For Pesticide Regulatory Evaluations And Simulations |
| ITCZ | Intertropical Convergence Zone (of Seawater) |
| BAT | Back Arc Tectonics |
| NPDOC | Non-purgeable Dissolved Organic Carbon |