The definition of zombie must evolve to include the emergence of phenomenon created in the digital age. "Zombie" must include machine networks or cyborg Multi-Agent Systems, drone robots and other unmanned or autonomous machines, and malicious software and zombie bots in cyberspace, in addition to the typical humans undergoing demonic possession, psychopharmacologically induced psychosis or virulent biologically transmitted diseases.
The term Zombie therefore refers to the observed behavior or presentation, rather then to the etiology of the disorder. The term "zombie" primarily refers to the continued or spontaneous malicious operation of a system, biological or machine, that appears to approximate functions under human operation but lacks the soul, willpower or humanity, typically present during the operation.
Zombies may be non-biological entities, Multi-Agent systems, killer robots or crazed undead humans. The important aspect of a zombie is that it is a malicious, parasitic predator without a conscience or ability to make free decisions. A shell with the ability to act, but without the ability to choose.
Unawareness and a lack of free will are key concepts of the biological form of zombie disorder. The common threads present in any of these definitions of zombie include Mindlessness - unthinking, unquestioning, compliant, Parasitic - requires host system, Bereft of self awareness or consciousness - a key lack of humanity or life essence, Performs malicious tasks - computer viruses, Predator drones and undead humans all preform malign tasks disruptive to humans, Under malign remote control or malicious per-defined autonomy - lack of free will, conscience or willpower, Host is unaware of zombie behavior - ignorance of effect on society and a lack of consciousness of its place in the larger Multi-Agent System.