Lexical Definition

‎ἐπισύστασις‎ episýstasis (ep-ee-soo'-stas-is) insurrection G:N-F
from the middle voice of a compound of ‎ἐπί‎ and ‎συνιστάω‎

that which cometh upon, + raising up.

Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
επισύστασισ ones conspiring with LXX.Num.16.40
επισυστάσει conspiring against LXX.Num.26.9

Abbott-Smith

ἐπι-σύστασις, -εως, ἡ (< ἐπισυνίστημι) [in LXX: Nu 16:40 (עֵדָה) 26:9 (נָצָה hi.), I Es 5:73 A* ;]
a gathering, a riotous throng: Rec. (for ἐπίστασις, q.v.), Ac 24:12, II Co 11:28.†

Abbott-Smith References

Book Refs
Numbers 16:40 · 26:9
Acts 24:12
2 Corinthians 11:28

Liddell-Scott-Jones

ἐπισύστασις, ἐπίστασις-στᾰσις, εως, ,

gathering, riotous meeting, τοῡ ὄχλου [NT]; αἱ τῶν κρατούντων τῆς χώρας βαρβάρων . [Refs 2nd c.BC+]; insurrection, [LXX+4th c.BC+]: with genitive, rising against, τοῦ Κυρίου [Refs]

__2 collection, κακῶν [Refs 2nd c.AD+]
__3 variant for{ἐπίστασις}, [NT]

LSJ Scripture Refs: Acts.24.12LXX.Num.16.402Cor.11.28