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navar

British  
/ ˈnævɑː /

noun

  1. a system of air navigation in which a ground radar station relays signals to each aircraft indicating the relative positions of neighbouring aircraft

"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

Etymology

Origin of navar

C20: from nav ( igational and traffic control rad ) ar