line of sight

noun phrase

Definition of line of sight 

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

First Known Use of line of sight

1559, in the meaning defined at sense 1

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The first known use of line of sight was in 1559

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line of sight

noun

Medical Definition of line of sight 

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

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