fal·si·ty

[fawl-si-tee]
noun, plural fal·si·ties.
1.
the quality or condition of being false; incorrectness; untruthfulness; treachery.
2.
something false; falsehood.

Origin:
1225–75; Middle English falsete < Anglo-French < Late Latin falsitās. See false, -ity

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World English Dictionary
falsity (ˈfɔːlsɪtɪ) [Click for IPA pronunciation guide]
 
n , pl -ties
1.  the state of being false or untrue
2.  something false; a lie or deception

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Falsity is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

falsity
1550s, from O.Fr. falsité (Mod.Fr. fausseté), from L. falsitas, from falsus (see false).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It is not trying to comment on the truth of falsity of the positions that
  people try to support by means of the fallacy.
It lives and dies on its ability to combine sincerity and falsity in
  approximately appropriate ratios.
Acts in deliberate ignorance of the truth or falsity of the information.
It happens to be false, and its falsity is pretty much manifest as soon as it
  is stated plainly.
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