| Subject | English | Russian |
| progr. | non-purely virtual class | неполностью виртуальный класс (github.io Alex_Odeychuk) |
| progr. | pure virtual class | чистый виртуальный класс (a class with all its public methods and properties defined as virtual or abstract and with a default, parameterless constructor defined as public or protected  github.io Alex_Odeychuk) |
| progr. | pure virtual class | полностью виртуальный класс (a class with all its public methods and properties defined as virtual or abstract and with a default, parameterless constructor defined as public or protected github.io Alex_Odeychuk) |
| progr. | purely virtual class | полностью виртуальный класс (github.io Alex_Odeychuk) |
| progr. | purely virtual class | совершенно виртуальный класс (github.io Alex_Odeychuk) |
| math. | virtual class | виртуальный класс |