noun, often attributive
ra·​dar | \ ˈrā-ˌdär How to pronounce radar (audio) \

Definition of radar

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 None had previously been on my radar, but all appealed to me. Washington Post, 10 July 2021 No one better understands why weather’s always on our radar than the weather stans who have built a robust online community of Facebook groups, fan sites, and forums. Shirley Li, The Atlantic, 10 July 2021 If a summer road trip is on your radar, don’t let the false sense of savings security fool you into blowing your budget. cleveland, 27 June 2021 Amazon is still dropping so many deals on comfy, breezy clothing that'll be perfect for 80-degree weather, and the Merokeety Boho Midi Skirt is one that should be on your radar. Sanah Faroke, PEOPLE.com, 25 June 2021 Clearly, Richardson will be staying on our radar until the Olympics on July 23 and most likely beyond. Gabi Thorne, Allure, 25 June 2021 According to many sources, the Premier League champions plan on making two marquee signings before the start of the 2021/22 season with Jack Grealish and Harry Kane on their radar. Graham Ruthven, Forbes, 25 June 2021 But three new basement bars should be on your radar. Tirion Morris, The Arizona Republic, 23 June 2021 But there may be one seemingly innocuous plant not on your radar, as one Facebook post claims. Miriam Fauzia, USA TODAY, 23 June 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'radar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of radar

1941, in the meaning defined at sense 1

History and Etymology for radar

radio detecting and ranging

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Learn More About radar

Statistics for radar

Last Updated

13 Jul 2021

Cite this Entry

“Radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radar. Accessed 23 Jul. 2021.

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More Definitions for radar



English Language Learners Definition of radar

: a device that sends out radio waves for finding out the position and speed of a moving object (such as an airplane)


ra·​dar | \ ˈrā-ˌdär How to pronounce radar (audio) \

Kids Definition of radar

: a radio device for detecting the position of things in the distance and the direction of moving objects (as distant airplanes or ships)

More from Merriam-Webster on radar

Nglish: Translation of radar for Spanish Speakers

Britannica English: Translation of radar for Arabic Speakers

Britannica.com: Encyclopedia article about radar


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