Strong's Greek Concordance

G1999: ἐπισύστασις

episýstasis · “insurrection”

Definition

a conspiracy, i.e. concourse (riotous or friendly)

KJV translates it as: that which cometh upon, + raising up

Word origin: from the middle voice of a compound of G1909 (ἐπί) and G4921 (συνιστάω);

Extended definition

ἐπι-σύστασις, -εως, ἡ
(ἐπισυνίστημι) [in LXX: Num.16:40 (עֵדָה) Num.26:9 (נָצָה hi.), I Est.5:73 A* ;]
a gathering, a riotous throng: Rec. (for ἐπίστασις, which see), Act.24:12, 2Co.11:28.†
(AS)

Abbott-Smith Manual Greek Lexicon (1922) via STEPBible TBESG (CC BY 4.0).