(law) the right to refuse to divulge information obtained in a confidential relationship WordNet 3.0 & Open English WordNet

In the law of evidence, a privilege is a rule of evidence that allows the holder of the privilege to refuse to disclose information or provide evidence about a certain subject or to bar such evidence from being disclosed or used in a judicial or other proceeding. Wikipedia

Rules excluding certain confidential communication from being admissible as evidence in court Wikipedia Disambiguation

Legal right or duty to refuse disclosure of evidence Wikidata

A common law doctrine that protects certain communications from being used as evidence in court. Wiktionary