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codeword

British  
/ ˈkəʊdˌwɜːd /

noun

  1. Also: codename.  (esp in military use) a word used to identify a classified plan, operation, etc

"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

Example Sentences

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The title embossed on the cover was simply "Director," above the words "Top Secret/Contains Codeword Material."

From Time • Apr. 28, 2011