Decennial Definition
 dĭ-sĕnē-əl 
    adjective
  
 Lasting ten years.
 Webster's New World 
Happening every ten years.
 Webster's New World 
    noun
  
 A tenth anniversary or its commemoration.
 Webster's New World 
Other Word Forms of Decennial
Noun
Singular:
 decennialPlural:
 decennialsOrigin of Decennial
-  
From Latin decennium a period of ten years decennium
From American Heritage Dictionary of the English Language, 5th Edition
 From Latin decennialis, French decem ten + ennius year- -ly
From Wiktionary
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