/ ˈsɜːtɪtjuːd; NAmE ˈsɜːrtɪtuːd/ noun
[ U , C ] ( formal ) 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
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WORD ORIGIN
late Middle English : from late Latin certitudo , from certus certain.