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Syllabification: ra·dar
Pronunciation: /ˈrāˌdär

Definition of radar in English:


1A system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of high-frequency electromagnetic waves that are reflected off the object back to the source.
Example sentences
  • Chavez reported that Venezuelan radar detected the presence of the ships and planes during the coup attempt.
  • That expelling of exhaust is vital in detecting their presence on radar.
  • Digital cellphones are similar to radar, using pulses carried by microwaves.
1.1An apparatus used for radar.
Example sentences
  • Invading foreign computer networks could shut down radars and electrical plants and disrupt telephone lines without firing a shot.
  • Cyclone detection doppler radars are replacing the conventional analogue radars in important locations along the east coast.
  • Park Air is a world leader in the field of integration, processing and display of data from radars, sensors and databases.
1.2Used to indicate that someone or something has or has not come to the attention of a person or group: the band has been kind of off the radar these past few years


1940s: from ra(dio) d(etection) a(nd) r(anging).

Definition of radar in:

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