Artificial intelligent assistant

ensurancer

enˈsurancer Obs.
  Also 7–8 insurancer.
  [f. ensurance + -er.]
  He who or that which gives assurance or confidence.

1665 Stillingfl. Grounds Prot. Relig. 162 Our Ensurancer in the main Principle of Faith concerning the Scriptures being the Word of God, is Apostolical Tradition.

Oxford English Dictionary

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