Artificial intelligent assistant

attestator

attestator ? Obs.
  (ætɪˈsteɪtə(r))
  [n. of agent after L. analogies (cf. It. attestatore, Florio) f. L. attestāri: see attest v. and -or.]
  = attester.

1598 Florio, Testatore, a witnes, an attestator, a testifier. 1789 in J. Downes Rosc. Angl. 16 The persons whom the clergyman mentioned as attestators to his character.

Oxford English Dictionary

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