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Done or communicated in confidence; secret.
(adjective)
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Entrusted with the confidence of another: a confidential secretary.
(adjective)
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Denoting confidence or intimacy: a confidential tone of voice.
(adjective)
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Containing information, the unauthorized disclosure of which poses a threat to national security.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.