| 1 | German | Einstein | an extremely intelligent person |
| 2 | German | ein | one; a, an; indicating motion into something |
| 3 | German | einschalten | to turn on, to switch on, to power up, to enable;... |
| 4 | German | ein- | generally indicating motion into something; one,... |
| 5 | Middle High German | īn- | — |
| 6 | Old High German | in | in |
| 7 | Proto-West Germanic | *in | — |
| 8 | Proto-Germanic | in | in; into |
| 9 | Proto-Indo-European | én | in |