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line of sight

noun
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.
Origin
1550-1560
1550-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for line-sight

line of sight

noun
1.
the straight line along which an observer looks or a beam of radiation travels
2.
(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
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6
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