Subpoena

A command, issued under a court's authority, to a witness to appear and give testimony.

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Duhaime Legal Dictionary

Latin: an order of a court which requires a person to be present at a certain time and place or suffer a penalty (subpoena means, literally, under penalty).

This is the traditional tool used by lawyers to ensure that witnesses present themselves at a given place, date and time to make themselves available to testify.

Lect Law Library

SUBPOENA - An order directed to an individual commanding him to appear in court on a certain day to testify or produce documents in a pending lawsuit.

A process to cause a witness to appear and give testimony, commanding him to lay aside all pretences and excuses, and appear before a court or magistrate therein named, at a time therein mentioned, to testify for the party named, under a penalty therein mentioned. This is usually called a subpoena ad testificandum.

On proof of service of a subpoena upon the witness, and that he is material, an attachment way be issued against him for a contempt, if he neglect to attend as commanded.

chancery practice. A mandatory writ or process, directed to and requiring one or more persons to appear at a time to come, and answer the matters charged against him or them; the writ of subpoena was originally a process in the courts of common law, to enforce the attendance of a witness to give evidence; but this writ was used in the court of chancery for the game purpose as a citation in the courts of civil and canon law, to compel the appearance of a defendant, and to oblige him to answer upon oath the allegations of the plaintiff.

Legal-Dictionary.org

A court order to appear in court.

The Free (Legal) Dictionary

A court, Grand Jury, legislative body, or Administrative Agency uses a subpoena to compel an individual to appear before it at a specified time to give testimony. An individual who receives a subpoena but fails to appear may be charged with Contempt of court and subjected to civil or criminal penalties. In addition, a person who has been served with a subpoena and has failed to appear may be brought to the proceedings by a law enforcement officer who serves a second subpoena, called an instanter.

A subpoena must be served on the individual ordered to appear. In some states a law enforcement officer or process server must personally serve it, whereas other states allow service by mail or with a telephone call. It is most often used to compel witnesses to appear at a civil or criminal trial.

Wikipedia

Subpoenas are usually issued by the clerk of the court (see below) in the name of the judge presiding over the case. Additionally, court rules may permit lawyers to issue subpoenas themselves in their capacity as officers of the court. Typically subpoenas are issued "in blank" and it is the responsibility of the lawyer representing the plaintiff or defendant on whose behalf the testimony is to be given to serve the subpoena on the witness.

The subpoena will usually be on the letterhead of the court where the case is filed, naming the parties to the case, and being addressed by name to the person whose testimony is being sought. It will contain the language "You are hereby commanded to report in person to the clerk of this court" or similar, describing the specific location, scheduled date and time of the appearance. Some issuing jurisdictions include an admonishment advising the subject of the criminal penalty for failure to comply with a subpoena, and reminding him or her not to leave the court facilities until excused by a competent authority. In some situations the person is paid.