Quick Definition
a conspiracy, plot
Strong's Definition
a swearing together, i.e. (by implication) a plot
Derivation: from a compound of G4862 (σύν) and G3660 (ὀμνύω);
KJV Usage: comspiracy
Thayer's Greek Lexicon
συνωμοσία, συνωμοσιας, ἡ (συνόμνυμι), from Aristophanes and Thucydides down, a swearing together; a conspiracy: συνωμοσίαν ποιεῖν (see ποιέω, L 1 c., p. 525a top), Act_23:13 Rec.; ποιεῖσθαι (see ποιέω, I. 3), ibid. L T Tr WH.
Mounce Concise Greek Dictionary
συνωμοσία synōmosia 1x
a banding by oath; a combination, conspiracy, Act_23:13
Abbott-Smith Greek Lexicon
**συνωμοσία , -ας , ή
(συνόμνυμι , to conspire ),
[in Sm .: Eze_22:25 * ;]
a conspiracy: Act_23:13 .†
Moulton & Milligan — Vocabulary of the Greek NT
συνωμοσία [page 616]
conspiracy, plot ( Act_23:13 ) : cf. Syll 461 (= .3 360) .45 ( c . B.C. 300 280) εἴ τινά κα συνωμοσίαν αἴσ [θω ]μαι ἐοῦσαν [ἢ γι ]νομέναν , ἐξαγγελῶ τοῖς δαμ [ιορ ]γοῖς , Cagnat IV. 914 .10 καταλύσαντα συν [ω ]μοσίαν μεγάλην .
Liddell-Scott — Intermediate Greek Lexicon
συνωμοσία συνωμοσία, ἡ, [Etym: συνόμνυμι] "a being leagued by oath, conspiracy", Ar. , Thuc. , etc.; ξ. δήμου καταλύσεως "for" putting down the democracy, Thuc. "a confederacy", id=Thuc. "a body of men leagued by oath, a political union or club", id=Thuc. , Plat.
STEPBible — Tyndale Abridged Greek Lexicon
συνωμοσία, -ας, ή
(συνόμνυμι, to conspire), [in Sm.: Eze.22:25 * ;]
a conspiracy: Act.23:13.†
(AS)