Artificial intelligent assistant

superseder

superseder
  (s(j)uːpəˈsiːdə(r))
  [f. supersede v. + -er1.]
  One who or that which supersedes.

1786 F. Burney Diary 25 Sept., My presidency was abolished..by the sudden return of its rightful superseder. 1835 Browning Paracelsus iv. 346 The delights you fain would think The superseders of your nobler aims. 1881 G. Allen Colin Clout's Cal. v. (1883) 28 The remaining ganoids, sharks, and lampreys all show signs of depending mainly upon smell, their modern superseders show signs of depending mainly upon sight.

Oxford English Dictionary

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