Septennial Definition

sĕp-tĕnē-əl
adjective
Happening every seven years.
Webster's New World
Lasting seven years.
Webster's New World
noun
An event that occurs every seven years.
American Heritage

Origin of Septennial

  • From Late Latin septennium period of seven years from Latin septennis of seven years septem seven septm̥ in Indo-European roots annus year at- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Late Latin septennium (“a period of seven years").

    From Wiktionary

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