From a presumed derivative of G2476 (like G4731); to set {fast} that {is} (literally) to turn resolutely in a certain {direction} or (figuratively) to confirm: - {fix} (e-) {stablish} stedfastly {set} strengthen.
From a primary word στίζω stizō (to {stick} that {is} prick); a mark incised or punched (for recognition of {ownership}) that {is} (figuratively) scar of service: - mark.