What do a.m. and p.m. stand for?

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
1550-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for line of sight
  • Conventional microscopes use lenses to magnify whatever is in the line of sight.
  • Lasers provide a better long-distance solution-but only if there is direct line of sight between source and device.
  • But that only allows correction for distortions along one line of sight.
  • As you can see, it's tilted pretty severely to our line of sight.
  • Another one is the track of a bicycle pedal, when the bicycle is traveling at right angles to your line of sight.
British Dictionary definitions for line of sight

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
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