quindecennial

English

Etymology

From Latin quindecennialis, from quindecennium (“15-year period”) + -alis (“-al: forming adjs”). Equivalent to quindec- +‎ -ennial.

Adjective

quindecennial (not comparable)

1. Lasting fifteen years.
2. Happening once in fifteen years.

Further reading

• “quindecennial”, in OneLook Dictionary Search.