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There are four meanings listed in OED's entry for the noun radar. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
noun [ C/U ] us / ˈreɪ·dɑr /. Add to word list. a device or system for finding the position or speed of objects, such as aircraft, that cannot be seen, by measuring the direction and timing of short radio waves that are sent out and reflect back from the objects.
Check pronunciation: radar. Definition of radar noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
The meaning of RADAR is a device or system consisting usually of a synchronized radio transmitter and receiver that emits radio waves and processes their reflections for display and is used especially for detecting and locating objects (such as aircraft) or surface features (as of a planet).
a system that uses radio waves to find the position and movement of objects, for example planes and ships, when they cannot be seen They located the ship by radar. a radar screen compare sonar
noun. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or perception. lobbyists working under the media's radar.
radar. / ˈreɪdɑː / noun. a method for detecting the position and velocity of a distant object, such as an aircraft A narrow beam of extremely high-frequency radio pulses is transmitted and reflected by the object back to the transmitter, the signal being displayed on a radarscope.
