line of sight: Meaning and Definition of

line' of sight'

1. Also calledan imaginary straight line running through the aligned sights of a firearm, surveying equipment, etc.
2. an imaginary line from an observer to a celestial body, coincident with the path traveled by light rays receivedfrom the body.
3. a straight line connecting two points sufficiently high and near one another so that the line is entirely above the surface of the earth.
4. See
5. sightline.