Artificial intelligent assistant

attestant

attestant, ppl. a. and n.
  (əˈtɛstənt)
  [ad. L. attestānt-em, pr. pple. of attestāri to attest: see -ant.]
  A. ppl. adj. Attesting, bearing witness. B. n. One who attests (by signature), an attester.

1880 H. Coote Gild of Knts. 8, A MS. deed to which these knights are attestants.

Oxford English Dictionary

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