Artificial intelligent assistant

presidentiary

presiˈdentiary, a. and n. Obs.
  [f. as prec. + -ary1.]
  A. adj. = presidential 2; presiding.

1668 H. More Div. Dial. v. x. (1713) 439 They [Angels] are Presidentiary Powers over such in this Terrestrial Region. 1681Exp. Dan. v. 144 Michael is the Presidentiary Angel of the Jewish Nation.

  B. n. A presidential or presidial officer.

1655 tr. Com. Hist. Francion ii. 2 You are more eloquent than all the parlaments, presidentiaries, and seneschals, or the subalternate courts of justice in France.

Oxford English Dictionary

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