Part of speech: noun

Confidence; precision; accuracy; a known truth.

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Usage examples "certainty":

  1. There is now a probability- almost a certainty- of its success. - "The Lone Ranche", Captain Mayne Reid.
  2. He's there, to a certainty, sir. - "Alice of Old Vincennes", Maurice Thompson.
  3. They should be considered not as a risk but as a certainty when once the foundations of order are uprooted. - "With the "Die-Hards" in Siberia", John Ward.