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radar - 6 dictionary results

ra⋅dar

[rey-dahr]
–noun
1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns.
2. a means or sense of awareness or perception: lobbyists working under the media's radar.

Origin:
1940–45, Americanism; ra(dio) d(etecting) a(nd) r(anging)
ra·dar   (rā'där)   
n.  
  1. A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency radio waves reflected from their surfaces.
  2. The equipment used in such detection.

[ra(dio) d(etecting) a(nd) r(anging).]

radar

A method of finding the position and velocity of an object by bouncing a radio wave off it and analyzing the reflected wave. Radar is an acronym for radio detection and ranging.

Note: Police use radar techniques to determine the speed of automobiles.
Language Translation for : radar
Spanish: radar,
German: der Radar,
Japanese: レーダー

radar 
1941, acronym (more or less) for radio detecting and ranging. The U.S. choice, it won out over British radiolocation.
radar   (rā'där)  Pronunciation Key 


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  1. A method of detecting distant objects and determining their position, speed, material composition, or other characteristics by causing radio waves to be reflected from them and analyzing the reflected waves. The waves can be converted into images, as for use on weather maps.
  2. The equipment used in such detecting. See also Doppler effect, lidar, sonar.

radar
radio detecting and ranging
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