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STD code

British  

noun

  1. a code of four or more digits, other than those comprising a subscriber's local telephone number, that determines the routing of a call

"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 STD code

C20: s ( ubscriber ) t ( runk ) d ( ialling )

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