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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