28 CFR 21.1: Definitions.
An agency process as defined by 5 U.S.C. 551 (5), (7) and (9).
Any person who is not a citizen or national of the United States.
Any action or suit, including any condemnation, preliminary, informational or other proceeding of a judicial nature. Examples of the latter include, but are not limited to, hearings and conferences before a committing court, magistrate, or commission, grand jury proceedings, pre-trial conferences, depositions, and coroners' inquests. It does not include information or investigative proceedings conducted by a prosecuting attorney for the purpose of determining whether an information or charge should be made in a particular case. The judicial proceeding may be in the District of Columbia, a State, or a territory or possession of the United States including the Commonwealth of Puerto Rico or the Trust Territory of the Pacific Islands.
A conference between the Government Attorney and a witness to discuss the witness' testimony. The conference must take place after a trial, hearing or grand jury proceeding has been scheduled but prior to the witness' actual appearance at the proceeding.
The term residence is not limited to the legal residence, but includes any place at which the witness is actually residing and at which the subpoena or summons is served. If the residence of the witness at the time of appearance is different from the place of subpoena or summons, the new place of residence shall be considered the witness' residence for computation of the transportation allowance; but, if the witness is on a business or vacation trip at the time of appearance, the witness shall be paid for travel from the place of service if this does not result in the witness being paid for more travel than is actually performed.
An official request, invitation or call, evidenced by an official writing of the court, authority, or party responsible for the conduct of the proceeding.