certainty

[sur-tn-tee]
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:
1250–1300; Middle English certeinte < Anglo-French, equivalent to certein certain + -te -ty2

noncertainty, noun, plural noncertainties.

certainty, certitude.


1. certitude, assurance, confidence. See belief. 2. truth.
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World English Dictionary
certainty (ˈsɜːtəntɪ)
 
n , 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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

certainty
c.1300, "surety, pledge," from Anglo-Fr. certeinté (late 13c.), O.Fr. certainté, from L. or V.L. *certanitatem (cf. O.Sp. 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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Example sentences
In fact, the one certainty is that the manager will eventually have a duff year
  when he earns no performance fee at all.
Truth comes from a process of empirical validation, not from self-confirming
  illusions of certainty because someone said it.
In fact, certainty has proved much easier to market.
However, only you can decide how important summer certainty at this place is
  for you.
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