Quick Definition
ὀμνύω v. I swear, take an oath
Strong's Definition
but obsolete omo, for which another prolonged form omoo om-o'-o is used in certain tenses; to swear, i.e. take (or declare on) oath
KJV Usage: swear
UBS Dictionary of the Greek New Testament
verb | inf. ὀμνύναι · aor. ὤμοσα · inf. ὀμόσαι | ὁρκωμοσία · συνωμοσία
33.463 · Communication · Swear, Put Under Oath, Vow
to swear, to make an oath, oath to affirm the truth of a statement by calling on a divine being to execute sanctions against a person if the statement in question is not true (in the case of a deity taking an oath, his divine being is regarded as validating the statement) In a number of languages it is necessary to be quite specific in referring to the swearing of an oath, for example, ‘to say something by calling upon God to listen’ or ‘to state that something is true and asking God to punish if it is not true’ or ‘to make God responsible for what one has said.’
For MRK 14:71 see 33.472.
MAT 5:34 · MAT 5:36 · MAT 23:16 · MAT 23:16 · MAT 23:18 · MAT 23:18 · MAT 23:20 · MAT 23:20 · MAT 23:21 · MAT 23:21 · MAT 23:22 · MAT 23:22 · MAT 26:74 · MRK 6:23 · MRK 14:71 · LUK 1:73 · ACT 2:30 · HEB 3:11 · HEB 3:18 · HEB 4:3 · HEB 6:13 · HEB 6:13 · HEB 6:16 · HEB 7:21 · JAS 5:12 · REV 10:6
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ὀμνύω (Mt. xxiii. 30 54. ; xxvi. 74; Heb. vi. 16; Jas. v. 12; [W. 347) and ὄμνυμι (ὀμνύναι, Mk. xiv. 71 GLT Tr WH [ef. B. 45 (39)]) form their tenses fr. OM0Q; hence 1 aor. ὥμοσα; Sept. for paw}; to swear; to affirm, promise, threaten, with an oath: absol., foll. by direct discourse, Mt. xxvi. 74; Mk. xiv. 71; Heb. vii. 21; foll. by εἰ, Heb. iii. 11; iv.3; 5686 εἰν 1.5. ὀμν. ὅρκον (often so in Grk. writ. fr. Hom. down [W. 226 (212) ]) πρός τινα, to one (Hom. Od. 14, 331; 19, 288), Lk. 1. 73; ὀμνύειν with dat. of the person to whom one promises or threatens something with an oath: foll. by direct disc. Mk. vi. 23; by an inf. [W. 331 (311) ], Heb. iii. 18; with ὅρκῳ added, Acts ii. 30 [W. 603 (561)]; τινί τι, Acts vii. 17 [Ree. i.e. gen. by attraction; ef. B.§ 143, 8; W.§ 24,1]. that by which one swears is indicated by an acc., τινά or τί (so in class. Grk. fr. Hom. down [ef. W. § 32, 1b. γι; B. 147 (128)]), in swearing to call a person or thing as witness, to invoke, swear by, (Is. xv. 16; Joseph. antt. 5, 1,2; 7, 14, 5); τὸν
Mounce Concise Greek Dictionary
ὀμνύω omnyō 26x
to swear, Mt. 5:34; to promise with an oath, Mk. 6:23; Acts 2:30; 7:17
Abbott-Smith Greek Lexicon
ὀμνύω
(so Hdt. and some Att. writers) and ὄμνυμι (so generally in Att. prose and always in Trag.; Mk 14:71, -ύναι), [in LXX chiefly for שׁבע ni.;]
to swear, affirm by oath: Mt 26:74, Mk 14:71, He 7:21; seq. εἰ (q.v.), He 3:11 4:3; c. dat. pers., Mk 6:23; id. c. inf., He 3:18; seq. ὅρκῳ, Ac 2:30; ὀ. ὅρκον πρός, c. acc. pers. (cl.), Lk 1:73; c. acc. (of that by which one swears; cl., v. MM, xviii), Ja 5:12; seq. κατά, c. gen. (LXX; Bl., § 34, 1), He 6:13, 16; seq. ἐν (εἰς), as in Heb. (Bl., § 39, 4), Mt 5:34, 36 23:16, 18, 20-22, Re 10:6 (Bl., § 70, 3).†
Liddell-Scott-Jones — Greek-English Lexicon
ὄμνυμι (omnumi) — to swear. ὄμνῡμι, [Refs 5th c.BC+]; imperative ὄμνῠθι [Refs 8th c.BC+]; 3rd.pers. singular ὀμνύτω [Refs]; 3rd.pers. plural ὀμνύντων. Foed. cited in [Refs 5th c.BC+]: imperfect ὤμνυν [Refs 5th c.BC+]: also (from present ὀμνύω) 3rd.pers. singular imperative ὀμνῠέτω [Refs 8th c.BC+]; participle ὀμνύουσα [Refs 4th c.BC+]: imperfect ὤμνῠον [Refs 8th c.BC+] (for present indicative the Trag. and [Refs 5th c.BC+] which also occurs in Comedy texts, [Refs 5th c.BC+]: future ὀμοῦμαι, εῖ, εῖται, [Refs 8th c.BC+]; Doric dialect 1st pers. plural ὀμιώμεθα [Refs 5th c.BC+]; later future ὀμόσω [Refs 1st c.AD+]: aorist ὤμοσα [Refs 8th c.BC+]; Epic dialect ὤμοσσα [Refs 8th c.BC+]: perfect ὀμώμοκα [Refs 5th c.BC+]: pluperfect ὠμωμόκειν [Refs 5th c.BC+]:—middle, [Refs 2nd c.AD+], aorist participle ὀμοσάμενος [Refs 3rd c.BC+]:—passive, future ὀμοσθήσομαι [Refs 5th c.BC+]: aorist ὠμόσθην [Refs 5th c.BC+]: perfect 3rd.pers. singular ὀμώμοται [Refs 5th c.BC+]; 3rd.pers. plural ὀμώμονται Legal cited in [Refs 5th c.BC+]; participle ὀμωμοσμένος [Refs 4th c.BC+]:—swear, with accusative cognate, ὀμνυέτω δέ τοι ὅρκον [Refs 8th c.BC+]:—passive, ὀμώμοται γὰρ ὅοκος ἐκ θεῶν [Refs 4th c.BC+]
II. swear to a thing, affirm or confirm by oath,
II.1. followed by accusative, ταῦτα δ᾽ ἐγὼν ἐθέλω ὀμόσαι [Refs 8th c.BC+]; ὄ. τὰς σπονδάς Foed. cited in [Refs 5th c.BC+]
II.2. followed by future infinitive, swear that one will.., [Refs 8th c.BC+] (present infinitive, [Refs 4th c.BC+] preceding the infinitive, καί μοι ὄμοσσον ἦ μέν μοι.. ἀρήξειν [Refs 8th c.BC+]aorist infinitive and ἄν, [Refs]: by present infinitive, swear that one does.., [Refs 5th c.BC+]: by perfect infinitive, swear that one has.., [Refs 5th c.BC+]: by aorist infinitive, swear that one did.., ὀμνύουσι μὴ 'κπιεῖν ἀλλ᾽ ἢ μίαν [Refs 5th c.BC+](aorist infinitive is perhaps used, without ἄν, in future sense, [Refs 4th c.BC+]: sometimes a clause follows in the indicative, ὀμνύω.., ἦ μὴν ἐγὼ ἐθυόμην [Refs 5th c.BC+]
II.3. absolutely, εἶπον ὀμόσας ἄν I would have given my word of honour, [Refs 5th c.BC+]
III. with accusative of the person or thing sworn by, swear by, νῦν μοι ὄμοσσον ἀάατον Στυγὸς ὕδωρ [Refs 8th c.BC+]; ὄμνυμι θεοὺς καὶ θεάς followed by infinitive, [Refs 5th c.BC+]; ἢ σιδαρέοισ; [NT+5th c.BC+]passive, ὀμώμοσται Ζεύς Zeus has been sworn by, adjured, [Refs 5th c.BC+]