Artificial intelligent assistant

decennal

decennal, a. ? Obs.
  (dɪˈsɛnəl)
  [ad. L. decennāl-is of ten years, f. decem + ann-us. Cf. F. décennal (16th c. in Hatzf.).]
  = decennial.

1648 ‘Mercurius Pragmaticus’ Plea for King 26 They..appointed Archons, or Decennall Governors, that is, one Prince for ten years. 1708 Motteux Rabelais (1737) V. 235 A Decennal Prescription.

Oxford English Dictionary

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