Definition of certitude noun from the Oxford Advanced Learner's Dictionary

 

certitude

 noun
noun
BrE BrE//ˈsɜːtɪtjuːd//
 
; NAmE NAmE//ˈsɜːrtɪtuːd//
 
[uncountable, countable](formal)
 
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a feeling of being certain; a thing about which you are certain ‘You will like Rome,’ he said, with absolute certitude. the collapse of moral certitudes Word Origin late Middle English: from late Latin certitudo, from certus ‘certain’.
See the Oxford Advanced American Dictionary entry: certitude