- ἕως (héōs) Attic
- αὔως (aúōs) Aeolic
- ᾱ̓ώς (āṓs) Doric
- ᾱ̓́ας (ā́as) Boeotian
- ᾱ̓βώρ (ābṓr) Laconian
From Proto-Hellenic *āhwōs = *ᾱϝ̔ως (*āwhōs), from Proto-Indo-European *h₂éwsōs (“dawn”), which was also personified as a goddess of dawn in Proto-Indo-European religion, corresponding to Ancient Greek goddess Ἠώς (Ēṓs). Cognates include Latin Aurora/aurora, Sanskrit उषस् (uṣás, “dawn; Ushas”) and possibly Old English Ēostre and Old Armenian այգ (ayg), առաւաւտ (aṙawawt).
- The morning red, daybreak, dawn
- Dawn as a length of time: morning
- (accusative, ἠῶ) through the morning
- A morning as a unit of time: day
- The direction of dawn, the East
Epic locative is ἠῶθι (ēôthi).