Definitions
1.nounAn object that marks the boundary of a piece of land (usually a stone, or a tree).
2.nounA recognizable natural or man-made feature used for navigation.
3.nounA notable location with historical, cultural, or geographical significance.
4.nounA major event or discovery."a landmark paper in neurosurgery"
5.verbTo officially designate a site or building as a landmark.