Lexical Definition

‎αὐγή‎ augḗ (owg'-ay) daybreak ^G:N-F
of uncertain derivation

break of day.

• a ray of light, i.e. (by implication) radiance, dawn

Abbott-Smith

αὐγή, -ῆς, ἡ, [in LXX: Is 59:9 (נְגֹהָה), II Mac 12:9*;]
1. brightness
2. Later (as in MGr.; MM, s.v.), daylight, dawn: Ac 20:11 (Cremer, 118).†
SYN.: φέγγος (v. Thayer, s. φ.; DB, iii, 44a; Tr., Syn., § xlvi).

Abbott-Smith References

Liddell-Scott-Jones

αὐγή, ἡ,

light of the sun, and in plural, rays, beams, πέπτατο δ᾽ αὐ. ἠελίου[Refs 8th c.BC+]; ἠελίου ἴδεν αὐγάς, i. e. was born, [Refs 8th c.BC+]; ὑπ᾽ αὐγὰς ἠελίοιο, i.e. still alive, [Refs 8th c.BC+]; αὐγὰς ἐσιδεῖν see the light, i.e. to be alive, [Refs 6th c.BC+]; ὑπ᾽ αὐγὰς λεύσσειν or ἰδεῖν τι hold up to the light and look at, [αὐγήν,">Refs 5th c.BC+] in a full and in a side light, [Refs 5th c.BC+]; δυθμαὶ αὐγῶν sun-set, [Refs 5th c.BC+]; ξύνορθρον αὐγαῖς dawning with the sun, [Refs 4th c.BC+]; κλύζειν πρὸς αὐγάς rise surging towards the sun, [Refs]; λαμπροτάτη τῶν παρεουσέων αὐγέων brightest light available, [Refs 5th c.BC+] 'life's setting sun', [Refs 4th c.BC+]

__2 αὐγαὶ ἠελίοιο or αὐγαί alone, the East, [Refs 2nd c.AD+]
__3 dawn, day-break, [NT]
__4 generally, any bright light, πυρὸς αὐγή[Refs 8th c.BC+]; ἀρίζηλοι δέ οἱ αὐγαί, of lightning,[Refs 5th c.BC+]; of a beacon, [Refs 8th c.BC+]; distinguished from φλόξ, [Refs 3rd c.BC+]
__5 of the eyes, ὀμμάτων αὐγαί[Refs 5th c.BC+]; αὐγαί alone, the eyes, [Refs 5th c.BC+]
__6 gleam, sheen, of bright objects, αὐ. χαλκείη[Refs 8th c.BC+]; of gems, [Refs 4th c.BC+], chiefly in the sense of sunlight.

_{LSJ Scripture Refs: Acts.20.11}