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
Weapons would fire in the direction of the mouse cursor, and targeting UI and radar were minimized to make the action the focus.
—
Alan Bradley, Space.com, 31 Jan. 2026
Set the scene Sundance has long maintained its beloved status as a locals’ mountain, remaining under-the-radar compared to neighboring resorts like Deer Valley and Park City (despite being just as accessible from SLC).
—Condé Nast, Condé Nast Traveler, 30 Jan. 2026
Forbes If Under 30 is on your radar, this belongs on your calendar.
—Alexandra York, Forbes.com, 30 Jan. 2026
Over the past few decades, Rosen writes, Russia has reopened and modernized more than 50 Cold War-era installations scattered along its Arctic coastline, including radar stations, airforce bases and self-sufficient military outposts.
—Tristan Bove, Fortune, 30 Jan. 2026
See All Example Sentences for radar
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Alan Bradley, Space.com, 31 Jan. 2026
Set the scene Sundance has long maintained its beloved status as a locals’ mountain, remaining under-the-radar compared to neighboring resorts like Deer Valley and Park City (despite being just as accessible from SLC).
—Condé Nast, Condé Nast Traveler, 30 Jan. 2026
Forbes If Under 30 is on your radar, this belongs on your calendar.
—Alexandra York, Forbes.com, 30 Jan. 2026
Over the past few decades, Rosen writes, Russia has reopened and modernized more than 50 Cold War-era installations scattered along its Arctic coastline, including radar stations, airforce bases and self-sufficient military outposts.
—Tristan Bove, Fortune, 30 Jan. 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 Feb. 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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