As used in this part, unless the context otherwise requires:
(1) “Executive authority,” “governor” and “chief magistrate,” respectively, as applied to a request to return any person under this part to or from the District of Columbia, include a justice of the supreme court of the District of Columbia and other authority;
(2) “Flight” and “fled” mean any voluntary or involuntary departure from the jurisdiction of the court where the proceedings mentioned may have been instituted and are still pending, with the effect of avoiding, impounding, or delaying the action of the court in which the proceedings may have been instituted or are pending, or any such departure from the state where the person demanded then was, if the person then was under detention by law as a person with mental illness and subject to detention; and
(3) “State” includes states, territories, districts and insular and other possessions of the United States.