radar

American  

[rey-dahr] / ˈreɪ dɑr /

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.

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radar British  

/ ˈreɪdɑː /

noun

1. Former name: radiolocation.  a method for detecting the position and velocity of a distant object, such as an aircraft A narrow beam of extremely high-frequency radio pulses is transmitted and reflected by the object back to the transmitter, the signal being displayed on a radarscope. The direction of the reflected beam and the time between transmission and reception of a pulse determine the position of the object

2. the equipment used in such detection

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radar Scientific  

/ rā′där /

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.

3. See also Doppler effect lidar sonar

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radar Cultural  

1. 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 ra dio d etection a nd r anging.

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Discover More

Police use radar techniques to determine the speed of automobiles.

Other Word Forms

• antiradar noun

Etymology

Origin of radar

1940–45, ra(dio) d(etecting) a(nd) r(anging)

Compare meaning

How does radar compare to similar and commonly confused words? Explore the most common comparisons:

• sonar vs. radar

Example Sentences

One, because she’s been on the radar for years as just a multitude of things, she’s multifaceted: Teyana Taylor can dance, she can sing, she’s just all of that and now acting alongside Leonardo DiCaprio.

From Los Angeles Times

Denmark’s defense buildup includes five Arctic-capable vessels, maritime patrol aircraft and enhanced radar systems.

From MarketWatch

In electronic warfare, communication, radar and other signals are targeted or protected.

From The Wall Street Journal

Nearby are vital submarine lanes, and the island hosts U.S. missile-defense radars that protect the homeland.

From The Wall Street Journal

But while Amanda's game plan slipped under the radar, the traitors have shared their suspicions that Fiona may be the secret traitor and "pretending to be a bit less perceptive than she actually is".

From BBC

Related Words

• sonar