for a certainty

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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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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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