| Acronym | Meaning |
| RCNDO/S | Rydberg CNDO/screened |
| CCR | Close-coupled Representation |
| CELRF | Canadian Environmental Law Research Foundation |
| ATM | Asynchronous Transfer Mode |
| PTA | Packed Tower Aeration |
| ARC | Antireflection Coating |
| TE | Thermionic Emission |
| DCXRD | Double Crystal X-ray Diffraction |
| ETA | Electrothermal Atomization |
| TAT | Technical Assistance Team |