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
The three areas discussed above, from cooling and data centers to petrochemicals, are fascinating areas to keep on the radar for those interested in learning about the drivers of energy demand and the energy transition space.
—
Simi Thambi, Forbes.com, 4 Apr. 2025
If it can be said that a company that can lay claim to nearly 12% of all U.S. video consumption has been flying under the sports-media rights radar, then YouTube is cruising along at an undetectable altitude.
—Anthony Crupi, Sportico.com, 4 Apr. 2025
Japan has stepped up military assistance, providing patrol vessels, radar systems, and coastal surveillance equipment through its Official Security Assistance framework.
—Lee Habeeb, MSNBC Newsweek, 3 Apr. 2025
Start with the following list of items that are always on real estate pros’ house-hunting radars.
—Berit Thorkelson, Better Homes & Gardens, 1 Apr. 2025
See All Example Sentences for radar
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Simi Thambi, Forbes.com, 4 Apr. 2025
If it can be said that a company that can lay claim to nearly 12% of all U.S. video consumption has been flying under the sports-media rights radar, then YouTube is cruising along at an undetectable altitude.
—Anthony Crupi, Sportico.com, 4 Apr. 2025
Japan has stepped up military assistance, providing patrol vessels, radar systems, and coastal surveillance equipment through its Official Security Assistance framework.
—Lee Habeeb, MSNBC Newsweek, 3 Apr. 2025
Start with the following list of items that are always on real estate pros’ house-hunting radars.
—Berit Thorkelson, Better Homes & Gardens, 1 Apr. 2025
See All Example Sentences for radar
Cite this Entry
“Radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radar. Accessed 12 Apr. 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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