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

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

Of course, Venus and Jupiter are nowhere close to each other physically but nearly in the same line of sight. —Mike Lynch, Twin Cities, 7 June 2026

Optical systems are blazing fast but require a direct line of sight and fail in murky water or when the buildup of microorganisms degrades the lenses. —Omar Kardoudi june 06, New Atlas, 6 June 2026

Because microlensing depends on one-off geometric alignments, the faraway object that caused the event by passing so perfectly through our line of sight can never be seen again. —Jonathan O'Callaghan, Scientific American, 4 June 2026

Word History

First Known Use

1559, in the meaning defined at sense 1

Rhymes for line of sight

• actinolite
• adipocyte
• amphibolite
• anorthosite
• anthophyllite
• aragonite
• carbonatite
• cassiterite
• chalcopyrite
• cristobalite
• crocidolite
• diatomite

Medical Definition

line of sight

noun

1

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

2

: line of vision