Disconfirmation Definition
    noun
  
 (chiefly philosophy, uncountable) Introduction of evidence which conclusively establishes that a belief or hypothesis is not true or which diminishes the acceptability of a belief or hypothesis.
Wiktionary 
(countable) A particular fact, observation, or other item of evidence which shows or tends to show that a belief or hypothesis is not true.
Wiktionary 
Other Word Forms of Disconfirmation
Noun
Singular:
 disconfirmationPlural:
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