radar
C1Primarily technical, but widely understood and used in everyday figurative contexts.
Definition
Meaning
A system for detecting the position, speed, and other characteristics of distant objects (e.g., aircraft, ships, weather) by sending out radio waves and analysing the reflected signals.
Any systematic method or range for detection, monitoring, or gathering information about a subject. Also, metaphorical for being aware, noticed, or under scrutiny.
Linguistics
Semantic Notes
The term has successfully moved from a highly technical military/acronym (RAdio Detection And Ranging) to general vocabulary, enabling rich metaphorical use (e.g., 'on someone's radar').
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Both use the term identically in technical and figurative contexts.
Connotations
Identical. The primary connotation is of detection, surveillance, and awareness.
Frequency
Equally frequent in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
N + of + radar (e.g., 'the use of radar')V + radar (e.g., 'use/operate/evade radar')ADJ + radar (e.g., 'sophisticated radar')PREP + radar (e.g., 'on/off the radar', 'under radar surveillance')Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “fly under the radar”
- “on/off the radar (screen)”
- “blip on the radar”
Usage
Context Usage
Business
Used metaphorically: 'This emerging market isn't even on our radar yet.' Meaning not being considered or monitored.
Academic
Used in physics, engineering, meteorology, and military history contexts to describe the technology and its applications.
Everyday
Figurative: 'That issue is firmly on my radar.' Meaning I am aware of and monitoring it.
Technical
Precise description of electromagnetic detection systems, including types like phased-array, synthetic aperture, or passive radar.
Examples
By Part of Speech
verb
British English
- The aircraft was radared by ground control as it entered restricted airspace.
- The new system can radar multiple targets simultaneously.
American English
- The storm cell was radared by the National Weather Service.
- Police used a device to radar the speed of oncoming cars.
adverb
British English
- Not a standard adverbial form; used adjectivally in compounds (e.g., radar-guided).
American English
- Not a standard adverbial form; used adjectivally in compounds (e.g., radar-detected).
adjective
British English
- The radar imagery showed a severe front approaching.
- They installed new radar dishes on the coast.
American English
- The radar data confirmed the tornado touchdown.
- He bought a radar detector for his cross-country drive.
Examples
By CEFR Level
- The plane has radar to see in the dark.
- The ship's radar found other boats.
- Air traffic controllers use radar to track all the planes.
- The weather forecast uses radar to show where it is raining.
- The new stealth technology is designed to be invisible to enemy radar.
- The issue of climate change has been on the government's radar for years.
- By keeping a low profile, the startup managed to fly under the radar of its larger competitors.
- Phased-array radar provides a significant tactical advantage through its rapid scanning capability.
Learning
Memory Aids
Mnemonic
RADAR is a palindrome—it reads the same forwards and backwards, just like the signal it sends out goes out and bounces back.
Conceptual Metaphor
AWARENESS/ATTENTION IS A RADAR SCREEN (e.g., 'It's on my radar.'); AVOIDING DETECTION IS FLYING UNDER RADAR.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Russian 'радар' is a direct loanword and is used correctly. No significant trap, but note the broader metaphorical usage in English may be more advanced.
Common Mistakes
- Misspelling as 'rador' or 'rader'.
- Incorrectly using 'sonar' for aerial detection (sonar is for sound underwater).
- Using the plural 'radars' awkwardly in figurative contexts; 'on my radar' is typically singular.
Practice
Quiz
In a business context, what does it mean if something is 'on your radar'?
FAQ
Frequently Asked Questions
Yes, it originated as the acronym RADAR, for 'RAdio Detection And Ranging'.
Yes, though it's less common and often technical (e.g., 'The object was radared at 10,000 feet'). The figurative use is almost always as a noun.
Radar uses radio waves and works in air or space. Sonar uses sound waves and works underwater.
It means to avoid detection or attention, often deliberately, by being inconspicuous.
Explore