Artificial intelligent assistant

sextennial

sextennial, a. rare—1.
  (sɛkˈstɛnɪəl)
  [irreg. f. L. sext-us sixth, after sexennial.]
  = sexennial.

1814 J. Adams Lett. J. Taylor x. Wks. 1851 VI. 468 The legislatures of the several states are balanced against the senate by sextennial elections.

Oxford English Dictionary

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