| Acronym | Meaning |
| PTR-MS | Proton Transfer Reaction-mass Spectrometry |
| OCT | Optical Coherence Tomography |
| SCCSA | Self-consistent Central-site Approxn. (for D.-of-states) |
| ABR | Advanced Breeder Reactor |
| BCKA | Branched-chain Keto-acid |
| OMO | Orthogonalized Magnetic Orbital |
| NMSC | Non-melanoma Skin Cancer |
| EINP | Energy-independent Nonlocal Pseudopotential |
| PIAC | Polymer Industrial Advisory Council |
| ELA | Experimental Lakes Area (northwest Ontario) |