certitude Meaning, Definition & Usage

  1. noun total certainty or greater certainty than circumstances warrant
    overconfidence; cocksureness.

WordNet

Cer"ti*tude noun
Etymology
LL. certitudo, fr. L. certus: cf. F. certitude. See Certain.
Definitions
  1. Freedom from doubt; assurance; certainty. J. H. Newman.

Webster 1913