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 of radar from the Web
To keep up with higher resolution forecast models, the National Oceanic and Atmospheric Administration has upgraded the Doppler radar on its hurricane hunter aircraft to give scientists a more detailed look at hurricane winds.
Australia is also planning to equip its three destroyers now under construction with the Aegis radar-and-combat system, which could be retrofitted for SM-3 missiles designed to take out medium-range ballistic missiles.
But there are other ways law enforcement unjustly exerts its power—and against other communities, too—that often slip below the national radar.
Before taking office on May 10, Moon Jae-in vowed to review the THAAD system’s deployment, which has infuriated both Pyongyang and Beijing, which considers the system’s powerful radar a security threat.
Lee-Huntsville's Malik Langham and Huffman's Allen Love are on the radar, but don't have offers yet.
Seventeen miles from the ship, his plane disappeared from radar.
Arroyo isn't one to test the limits of a radar gun.
Five years ago, corporate renewable-energy partnerships with utilities were barely a blip on the electric industry radar.
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.
Origin and Etymology of radar
radio detecting and ranging
First Known Use: 1941
RADAR Defined for English Language Learners
Definition of radar for English Language Learners
: a device that sends out radio waves for finding out the position and speed of a moving object (such as an airplane)
RADAR Defined for Kids
Definition of radar for Students
: a radio device for detecting the position of things in the distance and the direction of moving objects (as distant airplanes or ships)
Seen and Heard
What made you want to look up radar? Please tell us where you read or heard it (including the quote, if possible).