| 1 | Latin | aetherem | accusative singular of aethēr |
| 2 | Latin | aether | the upper, pure, bright air; ether; the heavens;... |
| 3 | Ancient Greek | αἰθήρ | heaven; aether; ether; theoretical medium of... |
| 4 | Ancient Greek | αἴθω | To ignite, kindle, light; To burn, blaze |
| 5 | Proto-Hellenic | *áitʰō | — |