Noun
negationism (usually uncountable, plural negationisms)
The revision of history in order to omit something that actually happened.
Just like the Russians have thrown Soviet historiography into the dustbin, Indian negationism will also be thrown out in the near future. Koenraad Elst
Techniques of negationism Historical negationism applies the techniques of research, quotation, and presentation for deception of the reader and denial of the historical record. Source: Internet