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
Kennedy, according to the former, further flew under the radar by not posing for photos during the event, which was also attended by Martha Stewart, Iman, Lionel Richie, Donatella Versace, Karlie Kloss and more.
—
Jami Ganz, New York Daily News, 30 Apr. 2026
With natural wonders like the iconic Saltos del Monday waterfall, and historic UNESCO sites like the Jesuit Missions of La Santísima Trinidad de Paraná, the landlocked country between Brazil, Argentina, and Bolivia is slowly making the radar of international tourists.
—Brittany Chang, Condé Nast Traveler, 29 Apr. 2026
There, the jurisdiction had enhanced police enforcement, installed a speed feedback radar and conducted public outreach.
—Karen Garcia, Los Angeles Times, 29 Apr. 2026
As the Navy gets ready to improve radar and power systems on its next ships, this continuity is crucial.
—Sujita Sinha, Interesting Engineering, 29 Apr. 2026
See All Example Sentences for radar
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Jami Ganz, New York Daily News, 30 Apr. 2026
With natural wonders like the iconic Saltos del Monday waterfall, and historic UNESCO sites like the Jesuit Missions of La Santísima Trinidad de Paraná, the landlocked country between Brazil, Argentina, and Bolivia is slowly making the radar of international tourists.
—Brittany Chang, Condé Nast Traveler, 29 Apr. 2026
There, the jurisdiction had enhanced police enforcement, installed a speed feedback radar and conducted public outreach.
—Karen Garcia, Los Angeles Times, 29 Apr. 2026
As the Navy gets ready to improve radar and power systems on its next ships, this continuity is crucial.
—Sujita Sinha, Interesting Engineering, 29 Apr. 2026
See All Example Sentences for radar
Cite this Entry
“Radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radar. Accessed 1 May. 2026.
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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