Quick Definition
ὁρκωμοσία, ας, ἡ n.f. the taking of an oath, an oath
Strong's Definition
from a compound of 3727 and a derivative of 3660; asseveration on oath
KJV Usage: oath
UBS Dictionary of the Greek New Testament
noun, f. | -ας | ὁρκίζω + ὀμνύω
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.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Mounce Concise Greek Dictionary
ὁρκωμοσία horkōmosia 4x
the act of taking an oath; an oath, Heb. 7:20, 21, 28*
Abbott-Smith Greek Lexicon
ὁρκωμοσία, -ας, ἡ
(< ὅρκος, ὄμνυμι; by metapl. for τὰ ὁρκωμόσια, asseverations on oath; v. MM, xviii), [in LXX: Ez 17:18, 19 (אָלָה) I Es 9:93*;]
affirmation on oath, an oath: He 7:20, 21, 28.†
Moulton & Milligan — Vocabulary of the Greek NT
ορκωμοσία [ε]ῦ εἴη, ἐφιορκοῦντι δὲ ἔνοχον εἶναι τῆι ἀσεβείαι τοῦ ὅρκου. With Lk 17 cf. Pelagia-Legenden p. 13° ἐν ὅρκῳ εἶχεν τοῦ μὴ γεύσασθαί τι. For an oath sworn on the Gospels see P Lond V. 1708728 (A.D. 567?) ἑκάστου τούτων ἐνωμότως θεμένου ὅρκον ἐπάνω τῶν σεπτῶν μεγαλί(-- el)wv, and cf. P Mon I, 176 (Α.Ὁ. 574) τὸν ἐνώμοτον Kal φρικτὸν ὅρκον ἐπὶ τῶν θείων καὶ ἀχράντων καὶ σεπτῶν κειμηλίων (“relics”). On various forms of oaths from the inscrr. see Herwerden Zex. s.v. ὅρκος, and for the idea of ‘‘ fence,” ‘‘something that shuts you in” (cf. the cognate ἕρκος), underlying the word cf. Murray Rise of the Greek Epic, p. 265 f. The dim. ὅρκιον is found in OG/S 45375 (B.C. 39-35).
Liddell-Scott-Jones — Greek-English Lexicon
ὁρκωμοσία (horkōmosia) — oath. ὁρκ-ωμοσία, ἡ, swearing, oath, [LXX+NT+2nd c.AD+]