1. (n.) The quality, state, or condition, of being certain.

2. (n.) A fact or truth unquestionable established.

3. (n.) Clearness; freedom from ambiguity; lucidity.

absolutely absoluteness acceptation acception acquiescence act of God actuality anticipation assurance assuredly assuredness authoritativeness belief certainly certitude confidence connection contemplation conviction credence credit credulity definitely definiteness dependence dogmatism expectancy expectation fact faith fate fatefulness firmness for a certainty for sure force majeure hope imminence indefeasibility indubitably ineluctability inescapableness inevasibleness inevitability inevitable accident inevitableness inexorability inflexibility irrevocability necessity positively positiveness positivism predetermination probability prospect reality reception relentlessness reliance reliance on self-assurance staunchness steadiness stock store sure thing surely sureness surety suspension of disbelief thought trust truth unastonishment unavoidable casualty unavoidableness uncontrollability undeflectability undeniably undoubtedly unpreventability unquestionably unyieldingness vis major