Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Occurring every seven years.
  • adj. Consisting of or continuing for seven years.
  • n. An event that occurs every seven years.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Lasting or continuing seven years; as, septennial parliaments.
  • adj. Happening or returning once in every seven years; as, septennial elections in England.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Lasting or continuing seven years.
  • adj. Happening or returning once in every seven years.

from The Century Dictionary and Cyclopedia

  • Lasting or continuing seven years: as, septennial parliaments.
  • Occurring or returning once in every seven years: as, septennial elections.

Etymologies

From Late Latin septennium, period of seven years, from Latin septennis, of seven years : septem, seven; see septm̥ in Indo-European roots + annus, year; see at- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Late Latin septennium ("a period of seven years"). (Wiktionary)

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