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English definition of “trade secret”

trade secret

noun [C] uk   us  
a piece of information about a product that is known only to the particular company that makes it: The exact ingredients of Coca-Cola are a trade secret. informal a piece of information that you are not willing to tell anyone: My aunt won't tell anyone her age - she says that it's a trade secret.
(Definition of trade secret from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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