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From The Collaborative International Dictionary of English v.0.48:
Uncertainty \Un*cer"tain*ty\, 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]