Artificial intelligent assistant

incidentary

inciˈdentary, a. Obs. rare.
  [f. incident n.1 + -ary. Cf. accidentary.]
  Casual, incidental. Hence inciˈdentarily adv., incidentally.

a 1670 Hacket Abp. Williams ii. (1692) 208 He had been near fifty years from the county of Carnarvan and the town of Conway, unless by incidentary visits.Cent. Serm. (1675) 621 They came together upon appointment, or incidentary occasions. Ibid., Incarn. iv, These 14 generations are reckoned up, and but 4 women incidentarily put into the catalogue.

Oxford English Dictionary

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