Etymology
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certitude (n.)

"certainty, complete assurance," early 15c., from Old French certitude "certainty" and directly from Late Latin certitudinem (nominative certitudo) "that which is certain," from Latin certus "sure, certain" (see certain).

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Definitions of certitude

certitude (n.)
total certainty or greater certainty than circumstances warrant;
Synonyms: cocksureness / overconfidence
From wordnet.princeton.edu