radar

[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.

radar

/ 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

radar

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

radar

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.

Police use radar techniques to determine the speed of automobiles.

Other Word Forms

• antiradar noun

Word History and Origins

Origin of radar¹

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

Word History and Origins

Origin of radar¹

C20 ra ( dio ) d ( etecting ) a ( nd ) r ( anging )

Example Sentences

The San Diego-based organization is operated by the FAA and uses radar technology to ensure the safe flow of planes through airspace surrounding dozens of airports across Southern California.

From Los Angeles Times

"Polish and allied aircraft are operating in our airspace, while ground-based air defence and radar reconnaissance systems have been brought to the highest state of readiness," Poland's operational command said in a post on X.

From BBC

She never felt comfortable in class and tried to “slide under the radar” — afraid that her unique voice, which resonates sweetly at a higher pitch — would cause classmates to tease her.

From Los Angeles Times

I, on the other hand, hadn’t registered on her radar as anything more than a professional colleague.

From Salon

Van der Velden discussed her AI production studio and her new AI talent agency - Xicoia - on Saturday, according to Deadline, and suggested that Hollywood studios and agencies were embracing AI under the radar.

From BBC

Related Words

• sonar