[ sur-tn-tee ]
See synonyms for certainty on Thesaurus.com
noun,plural cer·tain·ties.
  1. the state of being certain.

  2. something certain; an assured fact.

Idioms about certainty

  1. for / of a certainty, certainly; without a doubt: I suspect it, but I don't know it for a certainty.

Origin of certainty

1250–1300; Middle English certeinte<Anglo-French, equivalent to certeincertain + -te-ty2

synonym study For certainty

1. See belief.

Other words for certainty

Other words from certainty

  • non·cer·tain·ty, noun, plural non·cer·tain·ties.

Words that may be confused with certainty

Words Nearby certainty

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use certainty in a sentence

British Dictionary definitions for certainty


/ (ˈsɜːtəntɪ) /

nounplural -ties
  1. the condition of being certain

  2. something established as certain or inevitable

  1. for a certainty without doubt

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012