Radar meaning

rādär
Radar is a device that uses reflected radio waves to detect the position or movement of a person or thing.

An example of radar is the device highway patrol officers use to detect people who are driving too fast.

noun
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A microwave radio technology that uses reflected energy to detect and determine the direction of and distance to remote objects. Multiple return signals can be correlated over time to determine the velocity and direction of moving objects. Applications include navigation, targeting, and tracking for civilian and military purposes. See also microwave, radio, and sonar.
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A special ability to perceive, recognize, or find a particular kind of thing, behavior, etc.

A teacher's radar for plagiarism.

noun
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(RAdio Detection And Ranging) A method of determining the location and speed of an object. Radar works by transmitting signals and measuring the time it takes for them to bounce off the targeted object and return. See Doppler radar and LIDAR.
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A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of very high frequency radio waves reflected from their surfaces.
noun
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Any of various systems or devices using reflected radio waves to locate fixed objects and track moving ones: a radar system typically consists of a transmitter, receiver, and display screen, and is used in navigation, air traffic control, meteorology, mapping, etc.
noun
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Abbreviation of radio detection and ranging.
acronym
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A method of detecting distant objects and determining their position, speed, material composition, or other characteristics by causing radio waves to be reflected from them and analyzing the reflected waves. The waves can be converted into images, as for use on weather maps.
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The equipment used in such detection.
noun
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The equipment used in such detecting.
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on (one's) radar
  • In one's conscious awareness as a possibility or as an existing phenomenon:
    The governor said that running for president was not even on her radar screen.
idiom
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on (or off) the (or someone's) radar screen
  • noticed (or unnoticed) by someone
idiom
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0
under the radar screen
  • beyond someone's ability to notice or perceive
  • not attracting someone’s attention; not making an impression on someone
idiom
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Idioms and Phrasal Verbs

on (one's) radar
on (<i>or</i> off) the (<i>or</i> someone's) radar screen
under the radar screen

Origin of radar

  • ra(dio) d(etecting) a(nd) r(anging)

    From American Heritage Dictionary of the English Language, 5th Edition