| Acronym | Meaning |
| PBX | Plastic Bonded Explosive |
| ORU | In Orbit Replaceable Unit (spacecraft) |
| BOARS | Born-Oppenheimer Angular Radial Sepn. (in Mol. Complexes Calcns.) |
| LCMVAO | Linear Combination Of Modified Valence Atomic Orbital |
| EDD | Enforcement Decision Document |
| NRFE | Normalised Relative Fit Error |
| LRM | Laboratory Reference Material |
| CFBR | Conventional Fluidized Bed Reactor |
| EBS | Engineered Barrier System (for Hazardous Waste Disposal) |
| SILAC | Stable Isotope Labeling By Amino Acids In Cell Culture |