criticality

This term is defined in ECSS-Q-ST-30-02C as
combined measure of the severity of a failure mode and its probability of occurrence

This term is defined in ECSS-Q-ST-40C Rev.1 as
classification of a function or of a software, hardware or operation according to the severity of the consequences of its potential failures

This term is defined in ECSS-Q-ST-30C Rev.1 as
” classification of a failure or failure mode according to a combination of the severity of the consequences and its likelihood or probability of occurrence”