Definitions for "Survivability"
the capability of a system to fulfill its mission by preserving essential services, even when systems are penetrated and compromised
A measure of a network's ability to withstand failures in links and nodes.
A property of a system, subsystem, equipment, process, or procedure that provides a defined degree of assurance that the named entity will continue to function during and after a natural or man-made disturbance; e.g., nuclear burst.
Keywords:  deutsch, essential, still, degree, even
the degree to which essential functions are still available even though some part of the system is down [ Deutsch 88].