Meaning of quindecennial

quin•de•cen•ni•al

Pronunciation: (kwin"di-sen'ē-ul), [key]
— adj.
  1. of or pertaining to a period of 15 years or the 15th occurrence of a series, as an anniversary.
—n.
  1. a 15th anniversary.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.