1. (

• landmark

) the position of a prominent or well-known object in a particular landscape; "the church steeple provided a convenient landmark" ;

2. (

• landmark ,
• turning_point ,
• watershed

) an event marking a unique or important historical change of course or one on which important developments depend; "the agreement was a watershed in the history of both nations" ;

3. (

• landmark

) a mark showing the boundary of a piece of land ;

4. (

• landmark

) an anatomical structure used as a point of origin in locating other anatomical structures (as in surgery) or as point from which measurements can be taken ;