G1999 ἐπισύστασις (episýstasis)

KJV renderings: that which cometh upon, + raising up
Strong's definition: a conspiracy, i.e. concourse (riotous or friendly)
Derivation: from the middle voice of a compound of G1909 (ἐπί) and G4921 (συνιστάω);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.