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buffer zone

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noun
  1. a neutral zone or area between two potentially hostile nations, designed to prevent any overt acts of aggression.
  2. any area serving to mitigate or neutralize potential conflict.
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Origin of buffer zone

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for buffer zone

buffer zone

noun
  1. an area lying between two states and providing each with protection from the other
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012