uncertainty (nom)
Sens 1 : the quality of being uncertain in respect of duration, continuance,
occurrence, etc.; liability to chance or accident. [source : OED]
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Sens 2 : the quality of being indeterminate as to magnitude or
value; the amount of variation in a numerical result that is consistent with observation. [source : OED]
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Sens 3 : the state of not being definitely known or perfectly clear; doubtfulness
or vagueness. [source : OED]