| Acronym | Meaning |
| MSL | Mean Sea Level |
| MRSPT | Modified Rayleigh-Schroedinger Perturbation Theory |
| MARCKS | Myristoylated Alanine-rich C Kinase Substrate |
| ARRPA | Air Resources Regional Pollution Assessment Model |
| SCC | Self-consistent Charge Method |
| HFD | Hartree-Fock-dispersion (type Of Intermol. Potential) |
| FFTB | Final Focus Test Beam |
| HKS | Hohenberg-Kohn-Sham (quantum Theory) |
| LSDSIC | Local-spin-density Self-interaction-correction Approxn. (in Total Energy Calcns. For Atoms) |
| LID | Low Impact Developmentpar |