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Noun doubt has 2 senses
- doubt, uncertainty, incertitude, dubiety, doubtfulness, dubiousness - the state of being unsure of something
 
--1 is a kind of cognitive state, state of mind 
--1 has particulars: |   | mental reservation, reservation, arriere pensee; misgiving, mistrust, distrust, suspicion; incredulity, disbelief, skepticism, mental rejection; indecision, indecisiveness, irresolution; suspense |   
 - doubt, dubiousness, doubtfulness, question - uncertainty about the truth or factuality of existence of something; "the dubiousness of his claim"; "there is no question about the validity of the enterprise"
 
--2 is a kind of uncertainty, uncertainness 
  
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