Artificial intelligent assistant

annuller

annuller rare—1.
  (əˈnʌlə(r))
  [f. annul + -er1.]
  One who annuls, abolishes, or revokes.

1853 Malden Trans. Philol. Soc. VI. 53 Acrisius..in a mythical form the annuller of distinctions.

Oxford English Dictionary

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