landmark

UK: /ˈlændmɑː^rk/ US: /ˈlændˌmɑrk/ ,(land′märk′)

WordReference Random House Learner's Dictionary of American English © 2026

land•mark /ˈlændˌmɑrk/   n. [countable]

1. a feature in the landscape or an object in an area that is easily noticed or that serves as a guide, as to ships at sea or to travelers on a road:
   The tower is a local landmark.
2. something used to mark the boundary of land.
3. Architecture a building or other place of outstanding historical or cultural importance:
   The president's birthplace has been designated a landmark.
4. a very important, significant, or historic event, time, achievement, etc.:
   The decision is a landmark in constitutional law.

WordReference Random House Unabridged Dictionary of American English © 2026

land•mark  (land′märk′), n. 

1. a prominent or conspicuous object on land that serves as a guide, esp. 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.
2. something used to mark the boundary of land.
3. Architecture a building or other place that is of outstanding historical, aesthetic, or cultural importance, often declared as such and given a special status (land′mark designa′tion,) ordaining its preservation, by some authorizing organization.
4. a significant or historic event, juncture, achievement, etc.:
   The court decision stands as a landmark in constitutional law.

v.t. 

5. Architecture to declare (a building, site, etc.) a landmark:
   a movement to landmark New York's older theaters.

• bef. 1000; Middle English; Old English landmearc. See land, mark¹

Synonyms

• 4. milestone, watershed, benchmark.

Collins Concise English Dictionary © HarperCollins Publishers::

landmark / ˈlændˌmɑːk/ noun

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