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Synonyms of certainty in English:


  • 1 she knew with certainty that he was telling the truth
    [Antonyms] uncertainty, doubt
  • 2 he accepted defeat as a certainty that horse is a certainty for the 2.00 at Newmarket tomorrow
    inevitability, necessity, foregone conclusion, predictable result, matter of course, racing certainty;
    certain winner
    informalsure thing, cert, dead cert, sure-fire winner
    [Antonyms] possibility, impossibility
  • Definition of certainty in:

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