distant early warning

World English Dictionary
distant early warning
 
n
See also DEW line a US radar detection system to warn of missile attack

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Main Entry:  distant early warning
Part of Speech:  n
Definition:  a radar system set up in North America for the early detection of a missile attack; also called Distant Early Warning System
Example:  The Distant Early Warning System was established in the 1950s for the defensive advance warning radar system that provided "top cover" air defense for North America.
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