Emily Dickinson Lexicon

LAND'MARK, n. [land and mark.]

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. xix.
2. In navigation, any elevated object on land that serves as a guide to seamen.