[1] : The Collaborative International Dictionary of English v.0.48

uncertainty \uncer"tainty\, n.; pl. uncertainties.
   1913 webster
   1. the quality or state of being uncertain.
      1913 webster

   2. that which is uncertain; something unknown.
      1913 webster

            our shepherd's case is every man's case that quits a
            moral certainty for an uncertainty.   --l'estrange.
      1913 webster
see also:
uncertainties 

Uncertainties >> U Words
Uncertainties, definition of term: Uncertainties
uncertainties_pag1.html