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  1. Dictionary
    crit·i·cal·i·ty
    /ˌkridəˈkalədē/

    noun

    • 1. crucial importance: "all the agencies understand the criticality of their IT systems to their operations"
    • 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"

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