| Acronym | Meaning |
| MCTDHF | Multiconfiguration Time-dependent Hartree-Fock |
| DBPR | Microbiological And Disinfection Byproducts Regulations |
| NDT | Nil Ductility Temperature |
| ASSIST | Abstract Semi-Markov Specification Interface To The SURE Tool [propulsion] |
| NTB | Nonorthogonal Tight-binding |
| ETO | Exponential-type Orbital |
| NND | New And Nonofficial Drugs |
| TUES | Tubingen Ultraviolet Echelle Spectrometer |
| ORD | Office Of Research And Development (USEPA) |
| RMBPT | Relativistic Many-body Perturbation Theory |