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English definition of “code name”

code name

noun [C]    
a special word or name that is used instead of the real name of someone or something to keep the real name secret: Her code name is "Running Bear".Names and titles code-name     /ˈkəʊd.neɪm/ US  /ˈkoʊd-/ verb [T] [+ noun] We've code-named the new project "Entropy".Names and titles
(Definition of code name noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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