1an object or feature of a landscape or town that is easily seen and recognized from a distance, especially one that enables someone to establish their location:the spire was once a landmark for ships sailing up the river
North American a building or monument of historical importance:the entire town has been designated a National Historic Landmark
historical the boundary of an area of land, or an object marking this:at certain points of the boundary the men would beat the landmark with their sticks
2an event or discovery marking an important stage or turning point in something:the vaccine is a landmark in the history of preventive medicine
