Artificial intelligent assistant

antiphonical

antiˈphonical, a. Obs. rare—1.
  [f. as prec. + -ical.]
  = antiphonal.

1710 Wheately Com. Prayer 161 (T.) They sung in an antiphonical way.

Oxford English Dictionary

yu7NTAkq2jTfdvEzudIdQgChiKuccveC c7964aee3e928427e0f99db9e4327185