Quindecennial Definition

kwĭndĭ-sĕnē-əl
adjective
Happening every fifteen years.
Webster's New World
Lasting 15 years.
American Heritage
noun
A fifteenth anniversary or its commemoration.
Webster's New World

Origin of Quindecennial

  • From Latin quīndecim fifteen penkwe in Indo-European roots Latin -ennium (from annus year at- in Indo-European roots)

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

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