1.Definition: a mark showing the boundary of a piece of land

Category: General

2.Definition: 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

Category: General

3.Definition: an event marking a unique or important historical change of course or one on which important developments depend

Related Noun(s):watershed

Category: General

4.Definition: the position of a prominent or well-known object in a particular landscape

"The church steeple provided a convenient landmark"

Category: Places