| 1. | Also called line of sighting. an imaginary straight line running through the aligned sights of a firearm, surveying equipment, etc. |
| 2. | Astronomy. an imaginary line from an observer to a celestial body, coincident with the path traveled by light rays receivedfrom the body. |
| 3. | Radio. 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. | Ophthalmology. line of vision. |
| 5. | sightline. |
| line of sight n. pl. lines of sight
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