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Definition of certainty:

  1. A fact or truth unquestionable established.
  2. Clearness; freedom from ambiguity; lucidity.
  3. The quality, state, or condition, of being certain.


matter of course, induction, evidence, a safe bet, foregone conclusion, beyond (any) doubt, demonstration, belief, persuasion, self-assurance, hunch, inevitability, satisfaction, cinch, sure thing, firm/safe ground, deduction, consequence, ineluctability, a foregone conclusion, a mathematical certainty, inevitableness, positiveness, certain, firmness, true, reality, result, suspect, face, guarantee, assuredness, self-confidence, gut feeling/instinct, conclusion, doubtlessness, inference, cocksureness.

Usage examples:

  • In my place, I know to a certainty, Ernest, you'd have done exactly as I did.

    - "The Beckoning Hand and Other Stories The Beckoning Hand--Lucretia--The Third Time--The Gold Wulfric--My Uncle's Will--The Two Carnegies--Olga Davidoff's Husband--John Cann's Treasure--Isaline and I--Professor Milliter's Dilemma--In Strict Confidence--The ", Grant Allen.
  • And he was such a certainty to me.

    - "The Complete Project Gutenberg Works of George Meredith", George Meredith.
  • There was a reason for this certainty, right or wrong, in the minds of the sealers.

    - "Masters of the Wheat-Lands", Harold Bindloss.