- happening every fifteen years
- lasting fifteen years
Origin of quindecennialfrom Classical Latin quindecim (see quindecagon) + -ennial, as in biennial
a fifteenth anniversary or its commemoration
- Occurring once every 15 years.
- Lasting 15 years.
A 15th anniversary.
Origin of quindecennialFrom Latin quīndecim fifteen ; see penkwe in Indo-European roots.Latin -ennium ( from annus year ; see at- in Indo-European roots.)
- Lasting fifteen years.
- Happening once in fifteen years.