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national grid

noun
  1. British a network of high-voltage power lines connecting major power stations
  2. a grid of metric coordinates used by the Ordnance Survey in Britain and Ireland, and in New Zealand by the New Zealand Lands and Survey Department, and printed on their maps
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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