Ἠώς

[Meaning] the morning twilight before a day.¹ In reference to the goddess [sc. of that name, Eos]: "Dawn from her bed ...".² In reference to a whole day: "this is now the eleventh dawn ...".³ In reference to the early morning up to the sixth hour: "there will be a day or a morning or afternoon or mid-day ...".⁴
Day is called h)w/s in the common dialect [koinê], e(/ws in Ionic,⁵ a)w/s in Doric,⁶ [and] from this in Aeolic au)w/n⁷ and with alteration of the u, ai)w/n.⁸