mishmereth (Hebrew #4931)
watch, i.e. the act (custody), or (concr.) the sentry, the post; obj. preservation, or (concr.) safe; fig. observance, i.e. (abstr.) duty or (obj.) a usage or party
KJV usage: charge, keep, or to be kept, office, ordinace, safeguard, ward, watch.
Pronounce: mish-mer'-reth