Land·mark n.
 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.

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