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English definition of “certainty”

certainty

noun [C] (EXTREMELY LIKELY)    /ˈsɜː.tən.ti/ US  /ˈsɝː-/
C2 something that is very likely to happen : Joan will win - that's a certainty. [+ to infinitive] Joan is a certainty to win .Inevitable
(Definition of certainty noun (EXTREMELY LIKELY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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