1A system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects, by sending out pulses of radio waves which are reflected off the object back to the source.

1. 1.1count noun An apparatus used for radar.
   雷达设备，无线电探测器
   Example sentencesExamples

   • An incoming missile attack will initially be detected by the ship's long-range surveillance radar.
   • It's a network of radars and defensive missiles that will begin operating, at least some of them will, by 2004.
   • The Patriot's radar sends out electronic pulses that scan the air space above it.
   • The system uses the ship's three dimensional circular scan radar for target tracking.
   • Keep an eye on those radars, and listen to whatever is being said.
   • Our radars indicate a multitude of small incoming fighters.
   • Park Air is a world leader in the field of integration, processing and display of data from radars, sensors and databases.
   • Also in Alaska, there will be upgraded equipment and new radars for early warning.
   • Once Saki broke through the atmosphere, the ship's radar picked up an approaching craft.
   • Before these radars can become operational, the air force can use a medium-range unit with a range of 1,000 km.
   • It hovers high above the clouds and literally no radar can detect it because of its wind-elemental cloak.
   • Adjusting his grip on the controls, he began to veer away from the colony, lest he be detected by their radar.
   • Invading foreign computer networks could shut down radars and electrical plants and disrupt telephone lines without firing a shot.
   • ‘Some of the radars needed to track the incoming missile are not yet ready,’ says Marchildon.
   • Cyclone detection doppler radars are replacing the conventional analogue radars in important locations along the east coast.
   • The radars use high frequency and advanced radar signal processing technology to improve target resolution.
   • Our helicopters will rain fire down upon your camps before you detect them on your radar.
   • Lo said the vessel's automatic navigation system and radar were damaged during the attack.
   • An additional limb in front is equipped with a metal detector and radar to find mines, a second sprays paint on the ground to mark the spot.
   • Our mission was to look for hostile radars as they became active.
2. 1.2count noun A person's capacity for intuitive perception; a special sensitivity for factors, trends, etc.
   （人的）直觉感知能力；（对因素或潮流等的）敏感性
   keep your radar tuned to changes at work

   你要留意工作中的变化。

   Example sentencesExamples

   • She continued to explore adventurous roles whenever possible, though her radar was not always perfect.
   • But if you have an overly sensitive radar for cinematic pomp, stay clear.
   • Now emerging from under the radar is internet TV, but not TV as you've known it.
   • Harry Brown was never even a blip on the radar in any sense.
   • The casting directors all like to boast that they have a very sensitive radar for people who just want the celebrity of it.
   • It really is time to catch-up on Northern Ireland which has slipped off many radars, including mine, since September 11.
   • Yes, but this bishop passed under the cardinals' radars as well.
3. 1.3 Used to indicate that someone or something has or has not come to the attention of a person or group.
   he's off the radar in the UK but in his country of birth he's a well-known figure

   Example sentencesExamples

   • You may not know what you need, but at least by asking nightly, your radar will be wide open.
   • Winterland, a little CD released in the mid-80's and since having fallen under the radar, is one of the purest pleasures in the Hendrix catalog.
   • Yet Bad Dreams, at least for me, flew under the radar.
   • It rarely raises a blip on the international radar.
   • Going into the home stretch, the 2nd District race finally made it onto the national political radar.
   • Next, and this almost slipped under the radar, Craig paid nearly a quarter million dollars in legal fees with his campaign fund.
   • From a finance standpoint, Telemundo is the merest blip on GE's radar.
   • For Potterton and Dempsey, the deals must seem like minute blips on a large radar.
   • It probably didn't cross their radar, as often happens with celebrity figures who have never presented themselves primarily as romantic characters.
   • I wonder if there are lots of other conflicts dragging on in other regions below the media radar.
   • But there's often more egregious abuse among the tiny nonprofits that operate below the radar.
   • The new Russia is out to prove something, and I think Africa features prominently on their radar.
   • The big boys are on a merger binge that is paralyzing the industry and bumping fledgling and mid-range artists off the radar.
   • The bulk of the victims appear to be ordinary people who happen to have strayed across the media's radar.
   • With the exception of Moldova, this year's performances don't rate a blip on the comedic radar compared to last year.
   • Just a couple of things we want to put on your radar, certainly on our radar, this morning.
   • For every person like this, there are probably a dozen or more false teachers flying under the media's radar.
   • His private life better known in Britain than here at home has not appeared on the radar of the Canadian media.
   • Inner space has become a playground for uber-rich billionnaire tourists, and outer space is pretty much off the radar.
   • We moved over to a network that had a lot of other problems, which were sometimes good for us because we were not on their radar.