Artificial intelligent assistant

sexennarian

sexeˈnnarian rare—1.
  [f. L. sexenn-is (f. sex six + annus year) + -arian.]
  A six-year-old child. So seˈxennary a., sexennial; seˈxennate [after septennate], a period of six years.

1753 W. Maitland Hist. Edin. ii. 223 A Sexenary [sic, for sexennary] Account of Burials in the City of Exeter. 1821 Blackw. Mag. X. 118 Scholars..mostly quinquennarians, or at most sexennarians. 1890 Times 7 Feb. 5/2 The Government contemplated the consolidation of the sexennary bonds. 1898 Ibid. 16 Dec. 5/1 A further increase in the navy beyond the limits of Admiral Tirpitz's sexennate.

Oxford English Dictionary

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