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early-warning system

[ur-lee wawr-ning]
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noun
  1. Military. a network of radar installations designed to detect enemy aircraft or missiles in time for the effective deployment of defense systems.
  2. any series of steps established to spot potential problems.
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Origin of early-warning system

First recorded in 1945–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018