Artificial intelligent assistant

septennary

septennary, a.
  (sɛpˈtɛnərɪ)
  [f. L. septenn-is (f. sept-em seven + annus year) + -ary.]
  Septennial.

1644 Sir E. Dering Prop. Sacr. Pref. e, They are elder then my septennary examination, which is confined between 1633, and 1640. 1655 Fuller Ch. Hist. ii. x. §26 If Dunstan did septennary Penance, to expiate every mortall Sin. 1887 in Westm. Gaz. (1897) 6 Aug. 3/1 Whereas, by septennary revolutions, the Speakership of the Ports has now devolved upon us.

Oxford English Dictionary

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