From skeptomai (to peer about ["skeptic"], perhaps akin to σκάπτω (G4626) through the idea of concealment, cf σκέπασμα (G4629))
from σκέπτομαι sképtomai (to peer about ("skeptic"); perhaps akin to G4626 through the idea of concealment; compare G4629); a watch (sentry or scout), i.e. (by implication) a goal:—mark.
Outline
an observer, a watchman
the distant mark looked at, the goal or end one has in view