Lexical Definition

‎συστασιαστής‎ systasiastḗs (soos-tas-ee-as-tace') insurrectionist ^G:N-M
from a compound of ‎σύν‎ and a derivative of ‎στάσις‎

make insurrection with.

• a fellow-insurgent

Abbott-Smith

*† στασιαστής (< στασιάζω, to stir up sedition, Jth 7:15, II Mac 4:30 14:6 *)
= Att.. στασιώτης,
a rebel, revolutionist, one who stirs up sedition: Mk 15:7 (FlJ, al.).†

Abbott-Smith References

Liddell-Scott-Jones

συστασιαστής-ιαστής, οῦ, ὁ,

fellow-rioter, [NT+1st c.AD+]

_{LSJ Scripture Refs: Mark.15.7}