| Acronym | Meaning |
| MR-ACPF | Multireference-averaged Coupled Pair Functional |
| RAPID | Ruggedized Advanced Pathogen Identification Device |
| BTDC | Before Top Dead Center |
| MRINDO/S | Modified Rydberg Intermediate Neglect Of Differential Overlap/spectral (or Screening) |
| HMM | Heavy Meromyosin |
| ST4CCD | Coupled Cluster (with) Double (substitutions And) Single (and) Triple (substitutions Incorporated Via) Fourth-order (perturbat |
| DHS | Department Of Homeland Securitypar |
| APTIC | Air Pollution Technical Information Center |
| MURINES | Muon Ring Neutrino Experiments |
| LCA | Life Cycle Assessment |