Word Summary
omnyō: to swear, take an oath
Original Word: ὀμνύω
Transliteration: omnyō
Phonetic Spelling: (om-noo'-o)
Part of Speech: Verb
Short Definition: to swear, take an oath
Meaning: to swear, take an oath
Strong's Concordance

A prolonged form of a primary, 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 -- swear.

Thayer's Greek Lexicon
STRONGS NT 3660: ὀμνύω

ὀμνύω (Matthew 23:20; Matthew 26:74; Hebrews 6:16; James 5:12; (Winer's Grammar, 24)) and ὄμνυμι (ὀμνύναι, Mark 14:71 G L T Tr WH (cf. B. 45 (39))) form their tenses from ὈΜΟΩ; hence, 1 aorist ὤμοσα; the Sept. for נִשְׁבַּע ; to swear; to affirm, promise, threaten, with an oath: absolutely, followed by direct discourse, Matthew 26:74; Mark 14:71; Hebrews 7:21; followed by εἰ, Hebrews 3:11; Hebrews 4:3; see εἰ I. 5. ὀμνύειν ὅρκον (often so in Greek writings from Homer down (Winer's Grammar, 226 (212))) πρός τινα, to one (Homer, Odyssey 14, 331; 19, 288), Luke 1:73; ὀμνύειν with the dative of the person to whom one promises or threatens something with an oath: followed by direct discourse Mark 6:23; by an infinitive (Winer's Grammar, 331 (311)), Hebrews 3:18; with ὅρκῳ added, Acts 2:30 (Winer's Grammar, 603 (561)); τίνι τί, Acts 7:17 (Rec. i. e. genitive by attraction; cf. Buttmann, § 143, 8; Winer's Grammar, § 24, 1). that by which one swears is indicated by an accusative, τινα or τί (so in classical Greek from Homer down (cf. Winer's Grammar, § 32, 1 b. γ.; Buttmann, 147 (128))), in swearing to call a person or thing as witness, to invoke, swear by (Isaiah 65:16; Josephus, Antiquities 5, 1, 2; 7, 14, 5); τόν οὐρανόν, τήν γῆν, James 5:12; with prepositions (cf. Buttmann, as above): κατά τίνος (see κατά, I. 2 a.), Hebrews 6:13, 16 (Genesis 22:16; Genesis 31:54; 1 Samuel 28:10 (Complutensian); Isaiah 45:23; Isaiah 62:8; Amos 4:2; Demosthenes, p. 553, 17; 553, 26 (others, ἐπομνύειν), etc.; κατά πάντων ὠμνυε θεῶν, Long. past. 4, 16); in imitation of the Hebrew נִשְׁבַּע followed by בְּ, ἐν τίνι is used (Winers Grammar, 389 (364); Buttmann, the passage cited; see ἐν, I. 8{b}): Matthew 5:34, 36; Matthew 23:16, 18, 20-22; Revelation 10:6; εἰς εἰ, with the mind directed unto (Winers Grammar, 397 (371); Buttmann, as above; see εἰς, B. II. 2 a.), Matthew 5:35.

STRONGS NT 3660: ὁμόωὁμόω, see ὀμνύω.