quindecennial

(kwin′di senē əl)

adjective

  1. happening every fifteen years
  2. lasting fifteen years

Origin: < L quindecim (see quindecagon) + -ennial, as in biennial

noun

a fifteenth anniversary or its commemoration

See quindecennial in American Heritage Dictionary 4

adjective
  1. Occurring once every 15 years.
  2. Lasting 15 years.
noun
A 15th anniversary.

Origin:

Origin: From Latin quīndecim, fifteen; see penkwe in Indo-European roots

Origin: + Latin -ennium (from annus, year; see at- in Indo-European roots)

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