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early-warning radar

noun
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Definition of early-warning radar

: a set or line of radar sets operating in air defense on the perimeter or outward from the defended area to give the earliest possible warning of approaching airplanes

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“Early-warning radar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/early-warning%20radar. Accessed 29 Feb. 2020.

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