Un-cēr'tain-ty, n.

n. 1. The quality or state of being uncertain; doubtfulness; dubiousness; as, the latest accounts have not removed the uncertainty.

2. Contingency. “Steadfastly grasping the greatest and most slippery uncertainties.” South.
3. Want of certainty; want of precision; as, the uncertainty of the signification of words.
4. Something unknown or undetermined.

Our shepherd's case is every man's case that quits a certainty for an uncertainty. L'Estrange.