noun, plural uncertainties for 2.
the state of being uncertain; doubt; hesitancy: His uncertainty gave impetus to his inquiry.
an instance of uncertainty, doubt, etc.
unpredictability; indeterminacy; indefiniteness.

1350–1400; Middle English uncerteynte; see un-1, certainty

1. hesitation, irresolution, indecision, ambivalence.
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World English Dictionary
uncertainty (ʌnˈsɜːtəntɪ)
n , pl -ties
1.  Also called: uncertainness the state or condition of being uncertain
2.  an uncertain matter, contingency, etc

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Example sentences
But the data also shows something that may be much more important, though there
  are some considerable uncertainties involved.
So you might want to allow for this variation, account for your uncertainties
  and then evaluate your risk within that context.
To do this, it will be best to report the uncertainties.
But the success papers over the uncertainties that remain.
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