Definition of criticality in English:

criticality

noun

mass noun
  • 1Crucial importance.

    ‘all the agencies understand the criticality of their IT systems to their operations’
    ‘science underscores the criticality of a child's earliest years to better health in adulthood’
  • 2(of a nuclear reactor or fuel) the quality or state of maintaining a self-sustaining chain reaction.

    ‘reactor 4 at the Oi nuclear power plant reached criticality on Thursday morning’

Pronunciation

criticality

/ˌkrɪtɪˈkalɪti/