LANDMARK meaning : 1. a building or place that is easily recognized, especially one that you can use to judge where…. Learn more. A landmark is anything that helps you know where you are — in space, in time, in history. A landmark is a prominent or well-known feature of a landscape, a boundary marker, or a significant event in history. Find synonyms, translations, and related words for landmark in this comprehensive online dictionary. Definition of Landmark in the Definitions.net dictionary. Meaning of Landmark . What does Landmark mean ? Information and translations of Landmark in the most comprehensive dictionary definitions resource on the web.