Open English Wordnet
Nouns
(n)landmarkthe position of a prominent or well-known object in a particular landscape“the church steeple provided a convenient landmark” (n)landmark, turning point, watershedan 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” (n)landmarka mark showing the boundary of a piece of land (n)landmarkan 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