Classes Plantarum ('Classes of plants', Leiden, Oct. 1738) is a book that was written by Carl Linnaeus, a Swedish botanist, physician, zoologist and naturalist.

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.

n. statements and conversations made under circumstances of assured confidentiality which must not be disclosed in court. These include communications between husband and wife, attorney and client, physician or therapist and patient, and minister or priest with anyone seeing them in their religious status. In some states the privilege is extended to reporters and informants. Thus, such people cannot be forced to testify or reveal the conversations to law enforcement or courts, even under threat of contempt of court, and if one should break the confidentiality he/she can be sued by the person who had confidence in him/her. The reason for the privilege is to allow people to speak with candor to spouse or professional counsellor, even though it may hinder a criminal prosecution. The extreme case is when a priest hears an admission of murder or other serious crime in the confessional and can do nothing about it. The privilege may be lost if the one who made the admission waives the privilege, or, in the case of an attorney, if the client sues the attorney claiming negligence in conduct of the case. See also: attorney-client privilege