| Acronym | Meaning |
| GAGE | Global Atmospheric Gases Experiment |
| HMI | Hornbeck-Molnar Ionization (homonuclear Associative Ionization In At. Collisions) |
| ASE | Augmented Secular Equation |
| UAM-IV | Urban Airshed Model Version IV |
| NHFPT | Nonorthogonal Hartree-Fock Perturbation Theory |
| ASSIST | Abstract Semi-Markov Specification Interface To The SURE Tool [propulsion] |
| CNDO/B | Complete Neglect Of Differential Overlap / Boyd |
| HCD | Hollow Cathode Discharge |
| GDP | Gross Domestic Product |
| DNPH | 2,4-Dinitrophenylhydrazine |