Lexical Definition

‎ὦ‎ ō (o) oh! G:INJ
a primary interjection

O.

Abbott-Smith

ὦ
interj., c. vocat.,
O;
(a) in simple address (less freq. than in cl.; M, Pr., 71); Ac 1:1 18:14 27:21, Ro 2:1, 3 9:20, I Ti 6:20; expressing reproof, Ja 2:20;
(b) in exclamations of surprise, etc.: Mt 15:28, Lk 24:25, Ac 13:10, Ro 11:33, Ga 3:1; c. nom. (Bl., § 33, 4), Mt 17:17, Mk 9:19, Lk 9:41.†

Abbott-Smith References

Book Refs
Matthew 15:28 · 17:17
Mark 9:19
Luke 9:41 · 24:25
Acts 1:1 · 13:10 · 18:14 · 27:21
Romans 2:1 · 2:3 · 9:20 · 11:33
Galatians 3:1
1 Timothy 6:20
James 2:20

Liddell-Scott-Jones

ὦ

and ὤ, an exclamation, expressing surprise, joy, or pain, O! oh! with nominative, ὢ τάλας ἐγώ [Refs 5th c.BC+]: also with genitive, ὢ τῆς ἀναισχυντίας [Refs 2nd c.AD+]; with interrogative, ὤ, τί λέγει; [Refs]; in the middle of a sentence, [Refs 5th c.BC+]

__II with vocative, a mode of address, whether at the beginning of a sentence or in a parenthesis, ὦ Ἀχιλεῦ [ὦ ἄνδρες, τὴν δύναμιν κτλ. Antipho. 5.1 ">Refs 8th c.BC+]; in invocations of the gods, ὦ Ζεῦ τε καὶ Γῆ καὶ πολισσοῦχοι θεοί [ὦ χαῖρε [prev. author] “Ag.” 22, 5th c.BC: Sophocles Tragicus “Ajax” 91 ">Refs 5th c.BC+]; ὦ πρὸς θεῶν ὕπεικε [Refs 4th c.BC+]: sometimes following the Verb, [Refs 5th c.BC+]; in different number from the vocative, προσέλθετ᾽, ὦ παῖ, πατρί [Refs 5th c.BC+]
__II.2 with nominative instead of vocative, ὦ δῐος αἰθήρ, ὦ φίλος, [ὦ γενναῖος 5th-6th c.BC: Plato Philosophus “Phaedrus” 227c; ὦ οὗτος Αἴας 5th c.BC: Sophocles Tragicus “Ajax” 89; ὦ οὗτος οὗτος Οἰδίπους [prev. author] “OC” 1627 ">Refs 5th c.BC+]; also οὗτος, ὦ σέ τοι (i.e. καλῶ) [Refs 5th c.BC+]
__II.3 with both together, φίλος ὦ Μενέλαε [ὦ τλάμων πάτερ 5th c.BC: Sophocles Tragicus “Ajax” 641 (Lyric poetry, τλᾶμον codices recentia, editions). ">Refs 8th c.BC+]
__II.4 with the latter of two nouns, Ἀγάμεμνον, ὦ Μενέλαε [Refs].—In the first sense usually written ὤ, in the second ὦ: [τὸ ὢ] ἡνίκα θαυμαστικὸν λαμβάνεται βαρύνεται, καὶ χωρεῐ εἰς ἐπιρρηματικὴν σύνταξιν, οἷον ὢ Ἡρακλῆς [ὦ with the \_vocative\_, e.g. ὦ Ἡράκλεις, where the whole expression, and not merely the ὤ ">Refs] (ὦ,) expresses surprise (but [Refs 2nd c.AD+] seems to imply ὦ in both senses); ὤ as an exclamation is found in forms like{ὤ μοι}, ὤ μοι ἐγώ, ὢ πρὸς τῶν θεῶν [ὦ πόποι δυσὶ τόνοις χρῆται Hdn.Gr. 1.503, so that ὢ πόποι">Refs 4th c.BC+] is improbable,compare [Refs 9th c.AD+]; ᾤμοι and ὤμοι are both recognized by [Refs 7th c.BC+]; written ὼ ώ in Papyrus of [Refs 5th c.BC+]. To those who (like [ὦ">Refs 2nd c.BC+] for the vocative of the Article ὁ, [Refs 2nd c.AD+] replies at length.