confidential
adjective | \ ˌkän-fi-ˈden-chəl \ | con·fi·den·tial
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: known or conveyed only to a limited number of people a confidential disclosure
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: marked by or indicative of intimacy, mutual trust, or willingness to confide especially between parties one of whom is in a position of superiority the confidential relationship of doctor and patient
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: containing information whose unauthorized disclosure could be prejudicial to the national interest