| Subject | English | Japanese |
| gen. | approximation error | 近似誤差 (きんじごさ) |
| phys. | approximation formula | 近似式 (kinjishiki) |
| phys. | approximation method | 近似的方法 (きんぢてき・ほうほう) |
| gen. | first approximation theory for shells | 殻の一次近似理論 |
| tech. | method of approximation programming | 近似計画法 (きんじけいかくほう) |
| gen. | second approximation theory for shells | 殻の二次近似理論 |