Dictionary.com
definitions
  • synonyms

line of sight

See more synonyms for line of sight on Thesaurus.com
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. sightline.
Show More

Origin of line of sight

First recorded in 1550–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

beelineviewsightline

Examples from the Web for line of sight

Historical Examples

  • 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


British Dictionary definitions for line of 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
Show More
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