Artificial intelligent assistant

subsiduous

subˈsiduous, a. Obs. rare—1.
  [irreg. f. L. subsidium subsidy n. or F. subside subside n.: see -uous.]
  Assisting, subsidiary.

1490 Caxton Eneydos xix. 71/29 Y⊇ subsiduous [orig. F. subcide] modre that hath made the to be norysshed..wyth the mylke of the tygres of Yrcanye.

Oxford English Dictionary

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