an act of refuting a statement, charge, etc.; disproof.
Also, refutal [ri-fyoot-l] .

1540–50; < Latin refūtātiōn- (stem of refūtātiō), equivalent to refūtāt(us) (past participle of refūtāre to refute; see -ate1) + -iōn- -ion

nonrefutal, noun
nonrefutation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
refutation (ˌrɛfjʊˈteɪʃən)
1.  the act or process of refuting
2.  something that refutes; disproof

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Even a strong argument from purely factual premises is open to refutation
  unless it takes into account all relevant facts.
In the face of what a valid science would call a decisive refutation of their
  hypothesis, they react with: name change.
Ah, the one-off observation as refutation of extensive scientific research.
Unknown parts of the evidence are not cause for refutation of the theory, they
  are opportunities for further study.
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