| Subject | English | Thesaurus |
| nucl.phys., abbr. | Analytic Approximation Theory | AAT |
| chem., abbr. | Atomic Moment Approximation | AMA |
| math., abbr. | Best Affine Approximation | BAA |
| energ.ind., abbr. | Bethe-Born approximation | BB |
| phys., abbr. | Coherent Potential Approximation | CPA |
| abbr., nucl.phys. | completely slowing down approximation | csda (Пробег частиц в веществе polos) |
| nucl.phys., abbr. | Distorted Ware Born Approximation | DWBA |
| abbr., scottish | Doubly Asymptotic Approximation | DAA |
| abbr. | Fenton's Approximation Algorithm | FA (Alex Lilo) |
| abbr., phys. | HF approximation | Hartree-Fock approximation |
| abbr., tech. | Life Approximation Function | LAF (bonly) |
| abbr., IT | Polynomial Approximation with Exponential Kernel | PAEK (kotechek) |
| math., abbr. | Polynomial Time Approximation Scheme | PTAS |
| phys., abbr. | Quasi- Crystalline Approximation | QCA |
| math., abbr. | Rectangular Approximation Method | RAM |
| abbr., scient. | SCHF approximation | self-consistent Hartree-Fock approximation |
| auto.ctrl. | stochastic approximation | STA (ssn) |
| abbr. | Stochastic Approximation | SA (Alex Lilo) |
| abbr. | successive-approximation method | successive-approximation technique (ssn) |
| abbr. | successive-approximation technique | successive-approximation method (ssn) |
| phys., abbr. | Three-body Distorted-Wave Born Approximation | 3DWBA |
| abbr. | Variational Approximation | VA (Alex Lilo) |
| chem., abbr. | Virtual Crystal Approximation | VCA |
| phys., abbr. | Wavelet Based Fractal Approximation | WBFA |
| tech., abbr. | Wentzel-Kramers-Brilloin approximation | WKB |
| abbr., earth.sc. | WKB-Type approximation | Wentzel-Kramers-Brillouin-type approximation |
| abbr. | Workshop on Approximation and Online Algorithms | WAOA |
| nucl.phys., abbr. | Zero Range Approximation | ZRA |