| Acronym | Meaning |
| QCISD(T) | Quadratic CI (with) Single (and) Double (excitations) (and) [triple Excitations Added Perturbatively] |
| CPV | Canine Parvovirus |
| NTU | Number Of Transfer Units (in Packed Tower Aeration System) |
| TOX | Total Organic Halide |
| DAF | Decay-accelerating Factor |
| PVDC | Poly(vinylidene Dichloride) |
| TASO | Terminal Atom Symmetry Orbital |
| PICA | Picosecond Imaging Circuit Analysis |
| CMB | Core Mantle Boundary |
| STLS | Singwi-Tosi-Land-Sjolander (generalized Random-phase Approxn. For Effective Pair Potentials Of Liq. Metals) |