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English definition of “uncertainty”

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uncertainty

noun [C or U] uk   /ʌnˈsɜː.tən.ti/ us    /-ˈsɝː.tən.t̬i/
C1 a situation in which something is not known, or something that is not known or certain: Nothing is ever decided, and all the uncertainty is very bad for staff morale. Life is full of uncertainties.
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(Definition of uncertainty from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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