| Nominativ | ether, aeter, aether | aetheres |
| Genitiv | aetherum, aeteris, aeterum, aetheris | — |
| Dativ | aethere, etheri, aetheri, aetere | aetheribus |
| Akkusativ | aethera, aetheraque, aetheras, aetherem | — |
| Ablativ | aethere, aetere | aetheribus |
| Vokativ | aether, ether, aeter | aetheres |
