Longman Dictionary of Contemporary English homepage

confidentiality

 noun
     
con‧fi‧den‧ti‧al‧i‧ty [uncountable]
a situation in which you trust someone not to tell secret or private information to anyone else:
The relationship between attorney and client is based on confidentiality.
breach of confidentiality (=when someone gives away information they have promised to keep secret)
It's a breach of confidentiality for a priest to reveal what someone has said in the confessional.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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