1. Done or communicated in confidence; secret.
2. Entrusted with the confidence of another: a confidential secretary.
3. Denoting confidence or intimacy: a confidential tone of voice.
4. Containing information, the unauthorized disclosure of which poses a threat to national security.
con′fi·den′ti·ali·ty (-shē-ălĭ-tē), con′fi·dential·ness n.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.