Artificial intelligent assistant

availant

† aˈvailant, a. Obs. rare.
  [f. avail v. + -ant after ppl. adjs. from Fr.]
  = availing.

c 1420 Pallad. on Husb. xii. 126 A serpent skynne doon on this tree men lete Avaylant be to save it in greet hete.

Oxford English Dictionary

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