redefinition

/R IY0 D EH0 F AH0 N IH1 SH AH0 N/
noun
  1. 1

    The act or event of redefining.

    โ€œGeorge Orwell's novel 1984 proposed that people's thoughts could be constrained by the redefinition of words in their language.โ€

Source: https://en.wiktionary.org/wiki/redefinition