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 On radar, bats could be seen emerging from a cave at the Bracken Cave Preserve - a nightly occurrence - but then altering their path to flee east ahead of the storm. Matthew Cappucci, Anchorage Daily News, "Destructive hail bombards areas near Oklahoma City, Fort Worth and San Antonio," 29 Apr. 2021 Tornadoes are more than just swirling winds and colors on the radar. Dennis Mersereau, Forbes, "The Lasting, Unseen Damage Of Historic Tornado Outbreaks," 28 Apr. 2021 This team matched the Cubs' record with 116 wins (albeit, while playing 10 more games) but feels like a complete blip on the radar. Paul Newberry, Star Tribune, "Column: Dodgers have chance for baseball greatness," 23 Apr. 2021 On the radar: India's stock market has also pulled back from record highs reached in February, and could stay under pressure while the country tries to get the coronavirus back under control. Julia Horowitz, CNN, "The stock market is throwing a global party," 16 Apr. 2021 Knowing those lights were coming to the end of their lifespan, this has been on the radar for about three years. John Benson, cleveland, "Lakewood replacing light fixtures at Madison Park’s Usher Field," 17 Mar. 2021 Among those also on the radar is four-star quarterback A.J. Duffy (IMG Academy, Florida) who is scheduled to announce his decision on March 31, his mother's birthday. Michelle Gardner, The Arizona Republic, "Arizona State football lands 4-star safety Alfonzo Allen out of Florida," 13 Mar. 2021 But managers were keeping an eye on the radar as unstable air moved in. Gary Robbins, San Diego Union-Tribune, "Slow-moving storm could drop 2 feet of snow on Palomar by late Thursday," 10 Mar. 2021 Also Mark Schmidt, who’s the head coach at St. Bonaventure and another guy who’d be on the radar. Paul Daugherty, The Enquirer, "Doc's TML: In some places, Travis Steele would be on thin ice. Xavier isn't some places.," 8 Mar. 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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Statistics for radar

Last Updated

2 May 2021

Cite this Entry

“Radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/radar. Accessed 7 May. 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)

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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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