| Acronym | Meaning |
| MCRT | Mean Cell Residence Time |
| LHSF | Local Hyperspherical Surface Functions (in Quantum Calcns. On Reactive Scattering) |
| SCPT2 | Self-consistent Second-order Perturbation Theory |
| FPI | Fourier Path Integral |
| ECCES | Environmental Calculations Of Consequences From Energy Systems (model) |
| BPAI | Board Of Patent Appeals And Interferences |
| MIRIS | Multiple Internal Reflection IR Spectroscopy |
| CIPSI | Configuration Interaction Perturbing A Multiconfigurational Zeroth-order Wave Function Selected Iteratively |
| EOM | Extractable Organic Matter |
| PIII | Plasma Immersion Ion Implantation |