As used in this chapter:

(1) “Attack” means any action or series of actions causing, or which may cause, substantial damage or injury to persons or property by any means, including through biological, chemical, radiological, or nuclear means or through the use of other weapons, technologies, or processes.

(2) “Emergency event” means an impending or existing attack, act of terrorism, disease, accident, or other natural or man-made disaster that does 1 or more of the following:

a. Threatens the life, health, or safety of the public.

b. Has, or has the potential to, damage or destroy property or disrupt service, commerce, or other economic activities.

c. Makes the continuation of normal government operations difficult or impossible.

(3) “Incumbent member” means the individual holding an office under this chapter before the emergency event.

(4) “Member” means a member of the General Assembly under Article II of the Delaware Constitution.

(5) “Unavailable” means absent from the place of session other than on official business of the General Assembly or unable, for physical, mental, or legal reasons, to exercise the powers and discharge the duties of a member of the General Assembly, whether or not such absence or inability would give rise to a vacancy under the Delaware Constitution or other law of this State.

29 Del. C. 1953, § ?1703; 53 Del. Laws, c. 140; 81 Del. Laws, c. 449, § 10;