line of sight

American  

[lahyn uhv sahyt] / ˈlaɪn əv ˈsaɪt /

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.

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line of sight British  

noun

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

2. ophthalmol another term for line of vision

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Etymology

Origin of line of sight

First recorded in 1550–60

Example Sentences

For the entire tour Allen stood at the safety barriers, maintaining radio contact with his team and never leaving the band's line of sight.

From BBC

She was meant to be kept in line of sight by a staff member at all times.

From BBC

The event was exceptionally bright, and its light was further amplified by the gravity of a galaxy along the line of sight, making the distant explosion appear even more luminous.

From Science Daily

However, he added that this conflict could also fade into the background, and “if you do get a line of sight to normalcy, or towards a resolution, that’s where things can snap back.”

From Barron's

Strong enough that the company said Wednesday that it has “line of sight” to sales from that business topping $100 billion in 2027.

From The Wall Street Journal