Artificial intelligent assistant

promissary

ˈpromissary Obs. rare.
  [f. L. prōmiss-, ppl. stem of prōmittĕre (see promit v.) + -ary1.]
  1. (?) = procurator1.

c 1485 Digby Myst. (1882) iii. 237, I am pylat pr[o]mmyssary and presedent.

  2. = promisee.

1655 T. White Grounds Obed. & Govt. 36 He who maketh a promise to another, so it be a perfect one,..puts himselfe and his promissary into a rank of agency and patiency.

Oxford English Dictionary

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