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 (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.
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).