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
After a mom was accused of stopping her son’s medical treatment, their family disappeared from law enforcement’s radar for nearly four months, Florida authorities said.
—
Olivia Lloyd, Miami Herald, 3 Feb. 2025
Yet the control tower's radar apparently showed the helicopter at 200 feet at the time of the accident, though that information has not been confirmed.
—John Bacon, USA TODAY, 2 Feb. 2025
After the target was tracked by powerful radar, an interceptor was fired from a Vertical Launch System on the island, taking it out outside Earth’s atmosphere, according to releases by MDA and Lockheed Martin, the manufacturer of the Aegis system on Guam.
—Brad Lendon, CNN, 31 Jan. 2025
Within this, a key IFFR focus remains scouting and supporting filmmakers who may not be on the radar of more mainstream festivals.
—Melanie Goodfellow, Deadline, 31 Jan. 2025
See all Example Sentences for radar 
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Olivia Lloyd, Miami Herald, 3 Feb. 2025
Yet the control tower's radar apparently showed the helicopter at 200 feet at the time of the accident, though that information has not been confirmed.
—John Bacon, USA TODAY, 2 Feb. 2025
After the target was tracked by powerful radar, an interceptor was fired from a Vertical Launch System on the island, taking it out outside Earth’s atmosphere, according to releases by MDA and Lockheed Martin, the manufacturer of the Aegis system on Guam.
—Brad Lendon, CNN, 31 Jan. 2025
Within this, a key IFFR focus remains scouting and supporting filmmakers who may not be on the radar of more mainstream festivals.
—Melanie Goodfellow, Deadline, 31 Jan. 2025
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 16 Feb. 2025.
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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