line of sight

noun phrase

1
: a line from an observer's eye to a distant point
2
: the line between two points
specifically : the straight path between a transmitting antenna (as for radio or television signals) and a receiving antenna when unobstructed by the horizon

Examples of line of sight in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
When asked by prosecutor Laura Adams, Portocarrero testified that there was nothing in Pino’s line of sight that would have blocked his vision moments before the crash. Grethel Aguila, Miami Herald, 16 June 2026 Armed forces increasingly want autonomous systems that can shorten decision cycles, extend reconnaissance beyond line of sight, and continue operating in electronic warfare environments where GPS signals and communications links face disruption. Aamir Khollam, Interesting Engineering, 15 June 2026 The goal for the FAA’s Part 108 is to accommodate a new approval process for piloting drones beyond visual line of sight as well as a new airworthiness framework for ensuring public safety. Agamemnon Crassidis, The Conversation, 11 June 2026 Buildings, trees, hills and city haze can easily block Mercury, so the best viewing spots are open fields, beaches, elevated areas or any location with a clean line of sight toward the western horizon. Valerie Mesa, PEOPLE, 9 June 2026 See All Example Sentences for line of sight

Word History

First Known Use

1559, in the meaning defined at sense 1

Time Traveler
The first known use of line of sight was in 1559

Browse Nearby Words

Cite this Entry

“Line of sight.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/line%20of%20sight. Accessed 22 Jun. 2026.

Medical Definition

line of sight

noun
1
: a line from an observer's eye to a distant point
2
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