Meaning

noun the position of a prominent or well-known object in a particular landscape

noun an event marking a unique or important historical change of course or one on which important developments depend

noun a mark showing the boundary of a piece of land

originFrom Middle English *landmark, from Old English landmearc (“boundary”), from Proto-West Germanic *landamarku (“boundary, landmark”). Equivalent to land + mark. Cognate with German Landmarke (“landmark”), Danish landemærke (“landmark”), Swedish landmärke (“landmark”), Norwegian landemerke (“landmark”) and Faroese landamark (“land frontier”). Compare also Middle English londes-mark (“boundary”).

Etymology from Wiktionary, CC BY-SA 3.0