Freedom from conditions that can cause death, injury, occupational illness, damage to or loss of equipment or property, or damage to the environment.
Sources:
NIST SP 800-160 Vol. 2 Rev. 1
from
MIL-STD-882E, NIST SP 800-82r3
Expectation that a system does not, under defined conditions, lead to a state in which human life, health, property, or the environment is endangered.
Sources:
NIST SP 800-160v1r1
from
ISO/IEC/IEEE 12207:2017