a prominent or conspicuous object on land that serves as a guide, especially to ships at sea or to travelers on a road; a distinguishing landscape feature marking a site or location: The post office served as a landmark for locating the street to turn down.
something used to mark the boundary of land.
a building or other place that is of outstanding historical, aesthetic, or cultural importance, often declared as such and given a special status (landmark designation) ordaining its preservation, by some authorizing organization.
a significant or historic event, juncture, achievement, etc.: The court decision stands as a landmark in constitutional law.
verb (used with object)
to declare (a building, site, etc.) a landmark: a movement to landmark New York's older theaters.

before 1000; Middle English; Old English landmearc. See land, mark1

unlandmarked, adjective

4. milestone, watershed, benchmark. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
landmark (ˈlændˌmɑːk)
1.  a prominent or well-known object in or feature of a particular landscape
2.  an important or unique decision, event, fact, discovery, etc
3.  a boundary marker or signpost

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. landmearc, from land (n.) + mearc (see mark). Originally "object set up to mark the boundaries of a kingdom, estate, etc." Modern figurative sense of "event, etc., considered a high point in history" is from 1859.
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Landmark definition

a boundary line indicated by a stone, stake, etc. (Deut. 19:14; 27:17; Prov. 22:28; 23:10; Job 24:2). Landmarks could not be removed without incurring the severe displeasure of God.

Easton's 1897 Bible Dictionary
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Example sentences
Pilots flew by day, using visible landmarks to guide them.
Odder still, equivalent routes that have landmarks on them are also reckoned to
  be longer than routes that do not.
Using the application a tourist can stroll through the streets of a city and
  view the names of the landmarks in the vicinity.
The landmarks of his life turned out to be all around.
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