Artificial intelligent assistant

testifier

testifier
  (ˈtɛstɪfaɪə(r))
  [f. testify v. + -er1.]
  One who testifies; a witness.

1611 Cotgr., Tesmoing, a witnesse, testis, testifier. 1659 Pearson Creed i. (1662) 4 The strength and validity of every Testimony must bear proportion with the Authority of the Testifier. 1752 J. Gill Trinity i. 13 Though the Father, Word, and Spirit are one, yet not one person; because if so, they could not be three testifiers. 1854 E. G. Holland Mem. J. Badger xi. 209 Testifiers to the same fact.

Oxford English Dictionary

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