As used in this chapter, unless the context otherwise clearly indicates, the words designated in this section have the following meanings.
(A) "Attack" means any attack or series of attacks by an enemy of the United States causing, or which may cause, substantial damage or injury to civilian property or persons in the United States in any manner, by sabotage or by the use of bombs, missiles, shellfire or atomic, radiological, chemical, bacteriological or biological means or other weapons or processes.
(B) "Duly authorized deputy" means a person who is presently authorized to perform all of the functions, exercise all of the powers and discharge all of the duties of an office in the event the office is vacant or at such times as it lacks administration due to the death, absence or disability of the incumbent officer.
(C) "Emergency interim successor" means a person designated pursuant to this chapter for possible temporary succession to the powers and duties, but not the office of a city officer in the event that such officer or any duly authorized deputy is unavailable to exercise the powers and discharge the duties of the office.
(D) "State of extreme emergency," "state of disaster," "local peril," "local emergency" and "local disaster" have the same meanings as set forth in California Military and Veterans Code § 1505.
(E) "Unavailable" means either that a vacancy in office exists and there is no deputy authorized to exercise all of the powers and discharge the duties of the office or that the lawful incumbent of the office (including any deputy exercising the powers and discharging the duties of an office because of a vacancy) and his or her duly authorized deputy are absent or unable, for physical, mental or legal reasons, to exercise the powers and discharge the duties of the office.
(`78 Code, § 2.56.010)