line of sight
- Also called line of sighting. an imaginary straight line running through the aligned sights of a firearm, surveying equipment, etc.
- Astronomy. an imaginary line from an observer to a celestial body, coincident with the path traveled by light rays receivedfrom the body.
- 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.
- Ophthalmology. line of vision.
Origin of line of sight
First recorded in 1550–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for line of sight
He started the fuel pumps winding up, and swung the ship to point normal to the line-of-sight to the jammer.Pushbutton War
Joseph P. Martino
I'm inclined like everybody else to consider perception on a line-of-sight basis instead of on a sort of all-around grasp.Highways in Hiding
George Oliver Smith
There were other instruments in other line-of-sight positions, very far away.Operation Terror
William Fitzgerald Jenkins
line of sight
- the straight line along which an observer looks or a beam of radiation travels
- ophthalmol another term for line of vision
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012