Certainty /(?)/

Cer·tain·ty

Certainty

n.

pl. Certainties

  1. The quality, state, or condition, of being certain.
    The certainty of punishment is the truest security against crimes.
    — Fisher Ames.
  2. A fact or truth unquestionable established.
    Certainties are uninteresting and sating.
  3. Clearness; freedom from ambiguity; lucidity. (Law)

Phrases & Compounds
Of a certainty
certainly.