As used in this chapter:
(a) "Unavailable" means that the lawful incumbent of the office, including any deputy exercising the powers and discharging the duties of the office because of a vacancy, and his duly authority deputy, is not available to exercise the powers and discharge the duties of the office.
(b) "Disaster" means an extraordinary misfortune caused by an enemy attack upon the United States and resulting in wide destruction of life and property.
(c) "Enemy attack" means an attack or series of attacks by a power hostile to the United States which causes or may cause death, injury or substantial damage to the people and property in the United States by sabotage or by the use of bombs, missiles, shells or other weapons of conventional, atomic, radiological, chemical, bacteriological or any other nature, process or means.
(d) "Deputy" means any deputy, assistant or other subordinate officer authorized pursuant to law who exercises all of the powers and discharges the duties of an office.
(e) "Emergency interim successor" means a person designated, pursuant to this chapter, who, in the event the incumbent or the Deputy is unavailable, is to exercise the powers and discharge the duties of an office until a successor is appointed or elected and qualified as may be provided by law, or until the lawful incumbent or the Deputy is able to resume the exercise of the powers and discharge of the duties of the office.
(f) "Officer" means any elected or appointed officer or department head of the City Government, except those in the judiciary, who holds an office the powers and duties of which are defined by the Constitution or statutes of the State, the City Charter or these Codified Ordinances.
(1975 Code Sec. 1.142)