English to English
1. the position of a prominent or well-known object in a particular landscape
the church steeple provided a convenient landmark
2. an event marking a unique or important historical change of course or one on which important developments depend
the agreement was a watershed in the history of both nations
3. a mark showing the boundary of a piece of land
4. an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken
5. 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.