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
Smith would not comment on Rodriguez’s motive amid ongoing investigation but said that Rodriguez was not on police’s radar before the attack.
—
Miranda Jeyaretnam, Time, 22 May 2025
The likes of Real Madrid and Manchester City also have him on their radars, but not as the top option.
—David Ornstein, New York Times, 22 May 2025
Some hot-ticket items that should be on your radar include Samsonite’s spacious softside luggage that’s on sale for less than $150.
—Rylee Johnston, Travel + Leisure, 21 May 2025
Key Facts More than 40 reports of radar and radio failures at dozens of airports nationwide were filed to NASA’s Aviation Safety Reporting System since 2022, CNN reported.
—Suzanne Rowan Kelleher, Forbes.com, 21 May 2025
See All Example Sentences for radar
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Miranda Jeyaretnam, Time, 22 May 2025
The likes of Real Madrid and Manchester City also have him on their radars, but not as the top option.
—David Ornstein, New York Times, 22 May 2025
Some hot-ticket items that should be on your radar include Samsonite’s spacious softside luggage that’s on sale for less than $150.
—Rylee Johnston, Travel + Leisure, 21 May 2025
Key Facts More than 40 reports of radar and radio failures at dozens of airports nationwide were filed to NASA’s Aviation Safety Reporting System since 2022, CNN reported.
—Suzanne Rowan Kelleher, Forbes.com, 21 May 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 28 May. 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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