Artificial intelligent assistant

antiphonic

antiphonic, a. rare.
  (æntɪˈfɒnɪk)
  [f. Gr. ἀντίϕων-ος + -ic.]
  Antiphonal, mutually responsive.

1847 Barham Ingol. Leg. (1877) 401 The knight and the maiden had rung their antiphonic changes on her fine qualities.

Oxford English Dictionary

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