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permanent echo

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noun Electronics.

a radar signal reflected to a radar station on the ground by a building or other fixed object.

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Did you ever collect all those state quarters? Put them to good use on this quiz about curious state monikers and the facts around them.
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Mississippi’s nickname comes from the magnificent trees that grow there. What is it?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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