radar - Master This Word
Master this word with our 5-step learning method – Learn English in English
radar Word Meanings
- a system for detecting the presence, direction, distance, and speed of objects using radio waves
- a device employing this system
- to detect or monitor something
radar Example Sentences
Example sentences are the start of understanding. Don't rush to memorize. First feel how the word works in a sentence.
radar Phonetic & Pronunciation
UK
/ˈreɪ.dɑː/
US
/ˈreɪ.dɑːr/
radar Word Etymology
Radar = radio + detecting. Originated from 'Radio Detection and Ranging' in the 1930s. Picture the radar waves bouncing off an airplane, revealing its position and speed.
Note 1: These definitions and etymologies are not standard dictionary definitions, but extended explanations provided to help with memorization and understanding of the actual application of words. Through this background information, we strive to make words more vivid and easier to understand, and help you remember their meanings in real life.
Note 2: LexiTalk designs the learning flow around the linguistics principle of “Comprehensible Input.” When learners encounter material that is slightly above their level but still understandable from context, the brain naturally absorbs the language. That’s why we keep every word inside authentic contexts, using examples and associations to help you understand it and use it flexibly.
Read the FAQ explanation of Comprehensible InputEnglish Brain Route
I reach out, move my hand to wake the radar on the dashboard. The screen flickers and a line shifts as echoes rise from the air. I adjust the tilt and push a bit to keep the display steady, and the blips change as objects come into view. Watching and nudging the device makes me feel the distance and direction without a word.
Real Context
Radar refers to a system that uses radio waves to detect the presence, direction, distance, and speed of objects. It can describe the devices that use this system, or the act of monitoring something with such a device. The term comes from the abbreviation Radio Detecting And Ranging, coined in the 1930s during aviation and military research, and the image of waves bouncing off an airplane helped popularize it. In everyday English, radar is usually treated as a mass noun, as in the radar is on, though some technical uses treat it as countable, two radars.
Usage Reminders
- The radar is on. Radar systems collide with weather data when misused. Use radar and radar systems precisely. Do not confuse radar with radio. Plural form radars is possible but radar systems is preferred in formal writing. Pronounce as RAY-dar.
Common Misconceptions
- Radar is only a military tool and has no civilian uses.
- Radar detects sound waves like sonar.
- Radar can see through walls and solid objects.
- Radar and radio are the same thing.
- Radar is always a single device rather than a system.
Thinking Differences
Radar is a familiar, widely used term in English, so learners often focus on its origin as an acronym and forget everyday usage rules like countability and collocations with systems.
Learning Tips
- Listen to native speech to hear the stress on the first syllable
- Practice distinguishing uncountable vs countable usage
- Learn common collocations like radar system, weather radar
- Differentiate radar from radio; they are related but not the same
- Explore examples from weather, aviation, and automotive contexts
- Note plural form but favor radar systems in formal writing
5-Step Learning Method - Learn English in English
Step 1: Meaning
What is the meaning of the word 'radar'?
A.A musical instrument
B.A type of hat
C.A device for detecting objects in the air
D.A type of flower
Step 2: Usage
Which sentence uses the word 'radar' correctly?
A.She wore a radar on her head
B.He played music with radar
C.The radar detected incoming aircraft
D.The garden was filled with beautiful radars
Step 3: Similar Words
Which word is most similar to 'radar'?
A.Xylophone
B.Sonar
C.Periscope
D.Satellite
Step 4: Opposite Words
What is the opposite of 'radar'?
A.Antenna
B.Stealth
C.Disguise
D.Invisible
Step 5: Mastery
Can you think of a real-life context where 'radar' is used?
A.The doctor used a radar to diagnose the patient
B.The chef cooked a delicious meal
C.The teacher explained a difficult concept
D.The mechanic fixed the car
Related Listening
🌱 Lite (Beginner)
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