αἰθήρ

[edit] Ancient Greek

Wikipedia has an article on:

Aether

Wikipedia

αἰθήρ (genitive αἰθέρος) m, third declension; (aithēr)

air
aether; ether
theoretical medium of great elasticity and extreme thinness of consistency supposed to fill all unoccupied space and transmit light and heat
The upper or purer air as opposed to aer (αέρας), the lower air; the clear sky; the abode of the deitys. The personification of the pure upper air in which the divinitys reside, in contrary to the 'aer', the lower air which mortals breathe. In the early Greek cosmologies, Aether is the son of Erebus and Nyx, and the brother of Hemera. He is one of the elements of the cosmos and in the Orphic hymns he is mentioned as the soul of the world from which all life emanates.

Third declension of αἰθήρ, αἰθέρος

Case / #	Singular	Dual	Plural
Nominative	ὁ αἰθήρ	τώ αἰθέρε	οἱ αἰθέρες
Genitive	τοῦ αἰθέρος	τοῖν αἰθέροιν	τῶν αἰθέρων
Dative	τῷ αἰθέρῐ	τοῖν αἰθέροιν	τοῖς αἰθέρσῐ(ν)
Accusative	τόν αἰθέρᾰ	τώ αἰθέρε	τούς αἰθέρᾰς
Vocative	αἰθήρ	αἰθέρε	αἰθέρες