Quick Definition
O, an exclamation
Strong's Definition
as a sign of the vocative case, O; as a note of exclamation, oh
Derivation: a primary interjection;
KJV Usage: O
Thayer's Greek Lexicon
ὦ, an interjection, prefixed to vocatives (on its use in the N. T. cf. Buttmann, 140 (122); (Winers Grammar, § 29, 3)), O; it is used a. in address: ὦ Θεόφιλε, Act_1:1; add, Act_18:14; Act_27:21 (here Tdf. ὦ (ex errore); on the passages which follow cf. Buttmann, as above); Rom_2:1; Rom_2:3; Rom_9:20; 1Ti_6:20; and, at the same time, reproof, Jas_2:20.
b. in exclamation: and that of admiration, Mat_15:28; Rom_11:33 (here Rec.st Lachmann ὦ; cf. Chandler §§ 902 and especially 904); of reproof, Luk_24:25; Act_13:10; Gal_3:1; with the nominative (Winer's Grammar, § 29, 2), Mat_17:17; Mar_9:19; Luk_9:41. ((From Homer down.))
Mounce Concise Greek Dictionary
ὦ ō 17x
O!, Mat_15:28 ; Mar_9:19 ; Act_1:1 ; Rom_2:1 ; Rom_2:3 ; Rom_11:33
Abbott-Smith Greek Lexicon
ὦ ,
interj., c . vocat.,
O;
(a) in simple address (less freq . than in cl .; M , Pr., 71); Act_1:1 ; Act_18:14 ; Act_27:21 , Rom_2:1 ; Rom_2:3 ; Rom_9:20 , 1Ti_6:20 ; expressing reproof, Jas_2:20 ;
(b) in exclamations of surprise, etc.: Mat_15:28 , Luk_24:25 , Act_13:10 , Rom_11:33 , Gal_3:1 ; c . nom . (Bl., § 33, 4), Mat_17:17 , Mar_9:19 , Luk_9:41 .†
Moulton & Milligan — Vocabulary of the Greek NT
ὦ [page 701]
For ὦ as interj, c. voc, as in Act. 1:1 al. , cf. BGU II. 665 iii .8 (i/ A. D .) ἐρρῶσθ [αί σε ] εὔχ (ομαι ) ὦ πάτερ . Moulton in Proleg. p. 71 discusses the progressive omission of ὦ in Hellenistic as compared with classical Greek : cf. Blass-Debrunner § 146
STEPBible — Tyndale Abridged Greek Lexicon
ὦ
interj., with vocat.,
O;
__(a) in simple address (less frequently than in cl.; M, Pr., 71); Act.1:1 18:14 27:21, Rom.2:1, 3 9:20, 1Ti.6:20; expressing reproof, Jas.2:20;
__(b) in exclamations of surprise, etc.: Mat.15:28, Luk.24:25, Act.13:10, Rom.11:33, Gal.3:1; with nom. (Bl., § 33, 4), Mat.17:17, Mrk.9:19, Luk.9:41.†
(AS)