1. An object (as a stone or tree) that marks the boundary of land
2. An event or development that marks a turning point or a stage
It is very easy to remember the meaning of ‘Landmark’ as it can be broken down into ‘Land + Mark’ which would mean something that is supposed to mark a portion of land, in our case it can be used to mark anything like an event or development.
1. These are probably the last of the landmark civil-rights trials.
2. The eruption is a landmark event for a number of reasons.