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English definition of “certainty”

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certainty

noun uk   /ˈsɜː.tən.ti/ us    /ˈsɝː-/

certainty noun (IN NO DOUBT)

[C] something that cannot be doubted: There are few absolute certainties in life.B2 [U] the state of being completely confident or having no doubt about something: I'm unable to answer that question with any certainty.
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certainty noun (EXTREMELY LIKELY)

C2 [C] something that is very likely to happen: Joan will win - that's a certainty. [+ to infinitive] Joan is a certainty to win.
(Definition of certainty from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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