often attributive
1
: a device or system consisting usually of a synchronized radio transmitter and receiver that emits radio waves and processes their reflections for display and is used especially for detecting and locating objects (such as aircraft) or surface features (as of a planet)
2
: range of notice
fell off the radar after losing their first three games
Examples of radar in a Sentence
The approaching planes were detected by radar.
Recent Examples on the Web
New Hampshire New Hampshire has been on Republicans’ radar in recent years, but Democrats have prevailed there in federal elections since 2016, though by small margins.
—
Lauren Irwin, The Hill, 29 Nov. 2024
Ukrainian forces claim to have destroyed $5 million worth of Russian radar equipment in an attack in Crimea, crippling part of the Russian military's defense system.
—Yaakov Katz, Newsweek, 28 Nov. 2024
Weather warnings and watches around the US National weather radar
Travel records are also in forecast
Anything that jams up flights would be coming at a historically bad time.
—Gabe Hauari, USA TODAY, 28 Nov. 2024
Shaking up its consolidated format, the talent search competition is bestowing an initial reward on the finalists ahead of the award ceremony taking place IRL on March 20 in Trieste, Italy, the city off of fashion’s radar that has been home to ITS for the past 22 years.
—Martino Carrera, WWD, 28 Nov. 2024
See all Example Sentences for radar 
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Lauren Irwin, The Hill, 29 Nov. 2024
Ukrainian forces claim to have destroyed $5 million worth of Russian radar equipment in an attack in Crimea, crippling part of the Russian military's defense system.
—Yaakov Katz, Newsweek, 28 Nov. 2024
Weather warnings and watches around the US National weather radar
Travel records are also in forecast
Anything that jams up flights would be coming at a historically bad time.
—Gabe Hauari, USA TODAY, 28 Nov. 2024
Shaking up its consolidated format, the talent search competition is bestowing an initial reward on the finalists ahead of the award ceremony taking place IRL on March 20 in Trieste, Italy, the city off of fashion’s radar that has been home to ITS for the past 22 years.
—Martino Carrera, WWD, 28 Nov. 2024
See all Example Sentences for radar
Dictionary Entries Near radar
Cite this Entry
“Radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radar. Accessed 3 Dec. 2024.
Copy CitationKids Definition
radar
noun
ra·dar
ˈrā-ˌdär 
: a device that sends out radio waves for detecting and locating an object by the reflection of the radio waves and that may use this reflection to find out the position and speed of the object
Etymology
from radio detecting and ranging
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