WordReference Random House Learner's Dictionary of American English © 2015
cer•ti•tude /ˈsɝtɪˌtud, -ˌtyud/USA pronunciation n. [uncountable]

    freedom from doubt, esp. in matters of faith or opinion;
See -cert-.

Collins Concise English Dictionary © HarperCollins Publishers::

certitude /ˈsɜːtɪˌtjuːd/ n
  1. confidence; certainty
Etymology: 15th Century: from Church Latin certitūdō, from Latin certus certain

'certitude' also found in these entries:

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