| Subject | English | German |
| tech. | density of ionization | Ionenkonzentration |
| tech. | density of ionization | Ionendichte |
| phys. | ionization density | Ionisierungsdichte |
| radiat. | ionization density | Ionisierungsdichte (in irradiated matter: number of ion pairs per unit volume at a given time) |
| el. | ionization density | Ionisationsdichte |
| radiat. | ionization density | Ionisationsdichte (in irradiated matter: number of ion pairs per unit volume at a given time) |
| earth.sc. | volume ionization density | Volumenionisation |
| phys. | volume ionization density | räumliche Ionisationsdichte |
| earth.sc. | volume ionization density | Volumenionisationsdichte |
| earth.sc. | volume ionization density | Ionisationsdichte |