Artificial intelligent assistant

cojuror

cojuror
  [see co- 3 c.]
  One who takes an oath along with, or in confirmation of, another.

1735 M. Shelton tr. Wotton's Short View Hickes' Thes. 59 (T.) The solemn form of oaths: of a compurgator, or cojuror. The form of this oath is this: ‘I swear by God, that the oath which N. swore was honest and true’. 1865 Nichols Britton II. 336 It has been tried in full county by the oath of the tenant with two cojurors.

Oxford English Dictionary

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