Meaning of “confidential” in the English Dictionary

"confidential" in British English

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confidentialadjective

uk /ˌkɒn.fɪˈden.ʃəl/ us /ˌkɑːn.fəˈden.ʃəl/

C1 secret, often in a formal, business, or military situation:

All information will be treated as strictly confidential.

More examples

  • A person's medical records are confidential.
  • We have certain reasons for our decision, which have to remain confidential.
  • He locked the confidential documents in his filing cabinet.
  • The letter was marked 'Personal. Strictly confidential.'
  • Someone has leaked confidential government information to the press.
confidentially
adverb uk /ˌkɒn.fɪˈden.ʃəl.i/ us /ˌkɑːn.fəˈden.ʃəl.i/

Can I speak to you confidentially?
All information supplied will be treated confidentially.

(Definition of “confidential” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"confidential" in Business English

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confidentialadjective

uk /ˌkɒnfɪˈdenʃəl/ us

private, and intended to be kept secret:

confidential data/documents/information, etc. Prosecutors were not able to obtain confidential data from corporations without first receiving written approval from the department.
keep sth/remain confidential The bill would allow a business to keep its dealings confidential.
The company's former employees had made improper use of highly confidential information, such as names and addresses of customers.
All the employee questionnaires will be treated as strictly confidential.
confidential advice
The letter was marked "confidential".
confidentially
adverb /ˌkɒnfɪˈdenʃəli/ /ˌkɑː–/

Members of a client's workforce can discuss confidentially the reason for their absence, be it a mental or medical problem.

(Definition of “confidential” from the Cambridge Business English Dictionary © Cambridge University Press)