- 1 something, such as a large building, a mountain, etc., that you can see clearly from a distance and that will help you to know where you are The Empire State Building is a familiar landmark on the New York skyline.
- 2landmark (in something) an event, a discovery, an invention, etc. that marks an important stage in something synonym milestone The ceasefire was seen as a major landmark in the fight against terrorism. a landmark decision/ruling in the courts
- 3 a building or a place that is very important because of its history, and that should be preserved synonym monument