Land″mark′ (?), n. [AS. landmearc. See Land, and Mark a sign.] 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.