uncertainty

[uhn-sur-tn-tee]
noun, plural uncertainties for 2.
1.
the state of being uncertain; doubt; hesitancy: His uncertainty gave impetus to his inquiry.
2.
an instance of uncertainty, doubt, etc.
3.
unpredictability; indeterminacy; indefiniteness.

Origin:
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
There is little doubt that the eruptions happened, but there is uncertainty that they occurred before the extinctions.
There used to be a lot of fear, uncertainty, and doubt surrounding the performance impact of collisions.
The uncertainty surrounding climate change argues for action, not inaction.
Our second uncertainty might seem at first blush an outcome of the first.
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