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certainty

[sur-tn-tee] /ˈsɜr tn ti/
noun, plural certainties.
1.
the state of being certain.
2.
something certain; an assured fact.
Idioms
3.
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
1250-1300; Middle English certeinte < Anglo-French, equivalent to certein certain + -te -ty2
Related forms
noncertainty, noun, plural noncertainties.
Can be confused
certainty, certitude.
Synonyms
1. certitude, assurance, confidence. See belief. 2. truth.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for certainty

certainty

/ˈsɜːtəntɪ/
noun (pl) -ties
1.
the condition of being certain
2.
something established as certain or inevitable
3.
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
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Word Origin and History for certainty
n.

c.1300, certeynte, "surety, pledge," from Anglo-French certeinté (late 13c.), Old French certainete "certainty," from Latin or Vulgar Latin *certanitatem (source of Old Spanish certanedad); see certain. Meaning "that which is certain" is attested from early 14c.; meaning "quality of being certain" is from mid-14c.

Online Etymology Dictionary, © 2010 Douglas Harper
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