Uncertainty Definition
 ŭn-sûrtn-tē 
  uncertainties
  
    noun
  
 
    uncertainties
  
Lack of certainty; doubt.
 Webster's New World 
Something uncertain.
 Webster's New World 
The estimated amount or percentage by which an estimated or calculated value may differ from the true value.
 American Heritage 
(uncountable, mathematics) A parameter that measures the dispersion of a range of measured values.
Wiktionary 
Synonyms: 
  Other Word Forms of Uncertainty
Noun
Singular:
 uncertaintyPlural:
 uncertaintiesOrigin of Uncertainty
-  un- +"Ž certainty. From Wiktionary 
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