Artificial intelligent assistant

seventh-night

ˈseventh-night Obs.
  [f. seventh a. + night.]
  = sennight.

1625 B. Jonson Staple of N. i. v. 86 His Father dy'd on this day seuenth-night. 1672 Locke Let. to Mapletoft 19 Oct., That day seventhnight I parted from you.

Oxford English Dictionary

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