| 1 | French | radial | — |
| 2 | German | radial | radial; radially |
| 3 | Italian | radiale | radial; radial, radial tire; radial, radius bone |
| 4 | Spanish | radial | radial; of or pertaining to radio; radian |
| 5 | Spanish | radio | radio; radius; radium |
| 6 | French | radium | radium |
| 7 | French | radioactif | radioactive |
| 8 | French | actif | active; asset; top |
| 9 | Old French | actif | active |
| 10 | Latin | āctīvus | — |
| 11 | Ancient Greek | ἐνεργητικός | Able to act on; acting on; Active; In the active... |
| 12 | Ancient Greek | ἐνεργέω | to be in action or activity, to operate; to... |
| 13 | Ancient Greek | ἐνεργός | at work, active |
| 14 | Ancient Greek | ἔργον | deed, doing, action; labour, work, task;... |
| 15 | Proto-Hellenic | wérgon | work |
| 16 | Proto-Indo-European | wérǵom | work |