redefinition

noun

1. (countable, uncountable)The act or event of redefining.

   “George Orwell's novel 1984 proposed that people's thoughts could be constrained by the redefinition of words in their language.”

   “Although the value of the kilogram will not change, the redefinition of the kilogram using a constant will ensure it remains reliable, and enable far more accurate mass measurements in the future.”