- noun something on the ground which enables the pilot to know where he/she is, e.g. a noticeable building, bridge, coastal feature, etc.
- In the context of historic proper ties, an historic property that is listed on a local, state or federal register. Also a geographic or other easily recognizable feature, such as a monument, building, or other structure, used to navigate through an area.
- noun a distinctive natural or man-made feature, which can be used as a reference point or as an aid to navigation
- noun an important event or decision