Definify.com
Webster 1913 Edition
Landmark
1.
A mark to designate the boundary of land; any mark or fixed object (as a marked tree, a stone, a ditch, or a heap of stones) by which the limits of a farm, a town, or other portion of territory may be known and preserved.
2.
Any conspicuous object on land that serves as a guide; some prominent object, as a hill or steeple.
Landmarks of history
, important events by which eras or conditions are determined.
Webster 1828 Edition
Landmark
LAND'MARK
,Noun.
1.
A mark to designate the boundary of land; any mark or fixed object; as a marked tree, a stone, a ditch, or a heap of stones, by which the limits of a farm, a town or other portion of territory may be known and preserved.Thou shalt not remove thy neighbor's landmark. Deut. 19.
2.
In navigation, any elevated object on land that serves as a guide to seamen.