Etymology
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landmark (n.)

Old English landmearc "object set up to mark the boundaries of a kingdom, estate, etc.," from land (n.) + mearc in its sense "object which marks a boundary or limit" (see mark (n.1)). General sense of "conspicuous object which, by its known position, serves as a guide to a traveler," originally especially an object that can be seen from sea, is from 1560s. Modern figurative sense of "event, etc., considered a high point in history" is from 1859.

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Definitions of landmark

landmark (n.)
the position of a prominent or well-known object in a particular landscape;
the church steeple provided a convenient landmark
landmark (n.)
an event marking a unique or important historical change of course or one on which important developments depend;
Synonyms: turning point / watershed
landmark (n.)
a mark showing the boundary of a piece of land;
landmark (n.)
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;
From wordnet.princeton.edu