Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The state of being certain; complete assurance; confidence.
  • n. Sureness of occurrence or result; inevitability.
  • n. Something that is assured or unfailing: "eager to swap the hazards of American freedom for the gray certitudes of Soviet life” ( Time). See Synonyms at certainty.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. sureness, certainty
  • n. Something that is a certainty.

from the GNU version of the Collaborative International Dictionary of English

  • n. Freedom from doubt; assurance; certainty.

from The Century Dictionary and Cyclopedia

  • n. Certainty; complete assurance; freedom from doubt.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. total certainty or greater certainty than circumstances warrant

Etymologies

Middle English, from Late Latin certitūdō, from Latin certus, certain; see certain.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle French certitude, from Late Latin certitudo, from Latin certus (Wiktionary)

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