Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The state of being certain or convinced of something; complete assurance; confidence.
  • noun Something that is assured or believed to be true.

from The Century Dictionary.

  • noun Certainty; complete assurance; freedom from doubt.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Freedom from doubt; assurance; certainty.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun uncountable sureness, certainty
  • noun countable Something that is a certainty.

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

  • noun total certainty or greater certainty than circumstances warrant

Etymologies

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

[Middle English, from Late Latin certitūdō, from Latin certus, certain; see certain.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle French certitude, from Late Latin certitudo, from Latin certus

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