| Subject | English | Arabic |
| econ. | concept of a public service | مفهوم الخدمة العامة |
| econ. | concept of elasticity | مفهوم المرونة (نظرية المرونة) |
| environ. | concept of environment The development at any level of a general notion of the surrounding ecosystem, its foundational relationship to human life and the need to preserve its integrity | مفهوم البيئة |
| econ. | concept of public service | مفهوم الخدمة العامة |