Meaning of RADAR in English

n. 1 a system for detecting the direction, range, or presence of aircraft, ships, and other (usu. moving) objects, by sending out pulses of high frequency electromagnetic waves. 2 the apparatus used for this. radar trap the use of radar to detect vehicles exceeding a speed limit.

[ radio detection and ranging ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.