Quick Definition
a plot, design against
Strong's Definition
a plan against someone, i.e. a plot
Derivation: from a presumed compound of G1909 (ἐπί) and G1014 (βούλομαι);
KJV Usage: laying (lying) in wait
Thayer's Greek Lexicon
ἐπιβουλή, ἦς, ἡ, a plan formed against one (cf. ἐπί, D. 7), a plot: Act_9:24; γίνεται τινα ἐπιβουλή ὑπό τίνος, Act_20:3; εἰς τινα, Act_23:30; plural Act_20:19. (From (Herodotus), Thucydides down.)
Mounce Concise Greek Dictionary
ἐπιβουλή epiboulē 4x
a purpose or design against any one; conspiracy, plot, Act_9:24 ; Act_20:3 ; Act_20:19 ; Act_23:30
Abbott-Smith Greek Lexicon
ἐπι -βουλή , -ῆς , ἡ ,
[in LXX : Ezr_2:22 , 1Es_5:73 , 2Ma_5:7 , al. ;]
a plan against, a plot: Act_9:24 ; Act_20:3 ; Act_20:19 ; Act_23:30 .†
Moulton & Milligan — Vocabulary of the Greek NT
ἐπιβουλή [page 236]
For ἐ . = plot as quater in Ac, cf. P Oxy II. 237 vi. 31 (A.D. 186) πρόφασις δέ ἐστιν ἐπιβουλῆς , a pretext for plotting against me (Edd.), and ib. .6 ἑτέρῳ ἐπέτρεψεν τὴν κατ᾽ ἐμοῦ ἐπιβουλήν . The verb is found in P Oxy III. 472 .6 ( c. A.D. 130) εἰ δ᾽ ἄρα τις καὶ ἐπεβούλευσεν αὐτῷ , ὁ υἱὸς ἐπιτηδειότ̣α̣τος but if any one really plotted against him, his son is the most likely person (Edd.), BGU IV. 1024 iv. 10 (iv/v A.D.) σὺ δὲ ἐπεβούλευσας σώμα ( l. σώματι ) ἀλλοτρ [ι ]ωθέντι ὑπὸ τοῦ [γ ]ένους τῶν ἀνθρώπων , and from the inscrr. Syll 510 .32 (ii/B.C.) ὡς ἀπειθοῦντα καὶ ἐπιβουλεύοντα τοῖς συ (μ )φέρουσι τῆς πόλεως .
Liddell-Scott — Intermediate Greek Lexicon
ἐπιβουλή ἐπι-βουλή, ἡ, "a plan against" another, "a plot", Hdt. , Thuc.
STEPBible — Tyndale Abridged Greek Lexicon
ἐπι-βουλή, -ῆς, ἡ
[in LXX: Est.2:22, I Est.5:73, 2Ma.5:7, al. ;]
a plan against, a plot: Act.9:24 20:3, 19 23:30.†
(AS)