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trade secret noun

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Definition

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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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